diff --git a/app/BUILD.bazel b/app/BUILD.bazel
index 9cc32896072..69f7a4238c0 100644
--- a/app/BUILD.bazel
+++ b/app/BUILD.bazel
@@ -283,6 +283,7 @@ VIEW_MODELS = [
     "src/main/java/org/oppia/android/app/player/state/itemviewmodel/LessonProgressViewModel.kt",
     "src/main/java/org/oppia/android/app/player/state/itemviewmodel/MathExpressionInteractionsViewModel.kt",
     "src/main/java/org/oppia/android/app/player/state/itemviewmodel/NextButtonViewModel.kt",
+    "src/main/java/org/oppia/android/app/player/state/itemviewmodel/NumberWithUnitsInputViewModel.kt",
     "src/main/java/org/oppia/android/app/player/state/itemviewmodel/NumericInputViewModel.kt",
     "src/main/java/org/oppia/android/app/player/state/itemviewmodel/PreviousButtonViewModel.kt",
     "src/main/java/org/oppia/android/app/player/state/itemviewmodel/PreviousResponsesHeaderViewModel.kt",
@@ -383,6 +384,7 @@ VIEWS = [
     "src/main/java/org/oppia/android/app/customview/VerticalDashedLineView.kt",
     "src/main/java/org/oppia/android/app/customview/interaction/FractionInputInteractionView.kt",
     "src/main/java/org/oppia/android/app/customview/interaction/MathExpressionInteractionsView.kt",
+    "src/main/java/org/oppia/android/app/customview/interaction/NumberWithUnitsInputInteractionView.kt",
     "src/main/java/org/oppia/android/app/customview/interaction/NumericInputInteractionView.kt",
     "src/main/java/org/oppia/android/app/customview/interaction/RatioInputInteractionView.kt",
     "src/main/java/org/oppia/android/app/customview/interaction/TextInputInteractionView.kt",
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 7ed5ab01eb4..1f48f60bef5 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -220,6 +220,7 @@
     <activity android:name=".app.testing.HomeFragmentTestActivity" />
     <activity android:name=".app.testing.HomeTestActivity" />
     <activity android:name=".app.testing.InputInteractionViewTestActivity" />
+    <activity android:name=".app.testing.NumberWithUnitsInputInteractionViewTestActivity" />
     <activity android:name=".app.testing.RatioInputInteractionViewTestActivity" />
     <activity android:name=".app.testing.ImageRegionSelectionTestActivity" />
     <activity android:name=".app.testing.MathExpressionInteractionsViewTestActivity" />
diff --git a/app/src/main/java/org/oppia/android/app/activity/ActivityComponentImpl.kt b/app/src/main/java/org/oppia/android/app/activity/ActivityComponentImpl.kt
index d26c4ca132d..600df9c4288 100644
--- a/app/src/main/java/org/oppia/android/app/activity/ActivityComponentImpl.kt
+++ b/app/src/main/java/org/oppia/android/app/activity/ActivityComponentImpl.kt
@@ -84,6 +84,7 @@ import org.oppia.android.app.testing.InputInteractionViewTestActivity
 import org.oppia.android.app.testing.MarginBindingAdaptersTestActivity
 import org.oppia.android.app.testing.MathExpressionInteractionsViewTestActivity
 import org.oppia.android.app.testing.NavigationDrawerTestActivity
+import org.oppia.android.app.testing.NumberWithUnitsInputInteractionViewTestActivity
 import org.oppia.android.app.testing.PoliciesFragmentTestActivity
 import org.oppia.android.app.testing.ProfileChooserFragmentTestActivity
 import org.oppia.android.app.testing.ProfileEditFragmentTestActivity
@@ -165,6 +166,11 @@ interface ActivityComponentImpl :
   fun inject(imageRegionSelectionTestActivity: ImageRegionSelectionTestActivity)
   fun inject(imageViewBindingAdaptersTestActivity: ImageViewBindingAdaptersTestActivity)
   fun inject(inputInteractionViewTestActivity: InputInteractionViewTestActivity)
+  fun inject(
+    numberWithUnitsInputInteractionViewTestActivity:
+      NumberWithUnitsInputInteractionViewTestActivity
+  )
+
   fun inject(textInputInteractionViewTestActivity: TextInputInteractionViewTestActivity)
   fun inject(mathExpressionInteractionsViewTestActivity: MathExpressionInteractionsViewTestActivity)
   fun inject(ratioInputInteractionViewTestActivity: RatioInputInteractionViewTestActivity)
diff --git a/app/src/main/java/org/oppia/android/app/customview/interaction/NumberWithUnitsInputInteractionView.kt b/app/src/main/java/org/oppia/android/app/customview/interaction/NumberWithUnitsInputInteractionView.kt
new file mode 100644
index 00000000000..356f057ef81
--- /dev/null
+++ b/app/src/main/java/org/oppia/android/app/customview/interaction/NumberWithUnitsInputInteractionView.kt
@@ -0,0 +1,72 @@
+package org.oppia.android.app.customview.interaction
+
+import android.content.Context
+import android.graphics.Typeface
+import android.util.AttributeSet
+import android.view.KeyEvent
+import android.view.View
+import android.view.inputmethod.EditorInfo
+import androidx.appcompat.widget.AppCompatEditText
+import org.oppia.android.app.player.state.listener.StateKeyboardButtonListener
+import org.oppia.android.app.utility.KeyboardHelper.Companion.hideSoftKeyboard
+import org.oppia.android.app.utility.KeyboardHelper.Companion.showSoftKeyboard
+
+// TODO(#249): These are the attributes which should be defined in XML, that are required for this interaction view to work correctly
+//  hint="Write here."
+//  inputType="text"
+//  background="@drawable/edit_text_background"
+//  maxLength="200".
+
+/** The custom AppCompatEditText class for number with units input interaction view. */
+class NumberWithUnitsInputInteractionView @JvmOverloads constructor(
+  context: Context,
+  attrs: AttributeSet? = null,
+  defStyle: Int = android.R.attr.editTextStyle
+) : AppCompatEditText(context, attrs, defStyle), View.OnFocusChangeListener {
+  private var hintText: CharSequence = ""
+  private val stateKeyboardButtonListener: StateKeyboardButtonListener
+
+  init {
+    onFocusChangeListener = this
+    // Assume multi-line for the purpose of properly showing long hints.
+    isSingleLine = hint != null
+    stateKeyboardButtonListener = context as StateKeyboardButtonListener
+  }
+
+  // TODO(#4574): Add tests to verify that the placeholder correctly shows/doesn’t show when expected
+  override fun onFocusChange(v: View, hasFocus: Boolean) = if (hasFocus) {
+    hintText = hint
+    hideHint()
+    showSoftKeyboard(v, context)
+  } else {
+    restoreHint()
+    hideSoftKeyboard(v, context)
+  }
+
+  override fun onKeyPreIme(keyCode: Int, event: KeyEvent): Boolean {
+    if (event.keyCode == KeyEvent.KEYCODE_BACK && event.action == KeyEvent.ACTION_UP) {
+      clearFocus()
+      restoreHint()
+    }
+    return super.onKeyPreIme(keyCode, event)
+  }
+
+  override fun onEditorAction(actionCode: Int) {
+    if (actionCode == EditorInfo.IME_ACTION_DONE) {
+      stateKeyboardButtonListener.onEditorAction(EditorInfo.IME_ACTION_DONE)
+    }
+    super.onEditorAction(actionCode)
+  }
+
+  private fun hideHint() {
+    hint = ""
+    typeface = Typeface.DEFAULT
+    isSingleLine = true
+  }
+
+  private fun restoreHint() {
+    hint = hintText
+    if (text?.isEmpty() == true) setTypeface(typeface, Typeface.ITALIC)
+    isSingleLine = false
+  }
+}
diff --git a/app/src/main/java/org/oppia/android/app/player/state/StatePlayerRecyclerViewAssembler.kt b/app/src/main/java/org/oppia/android/app/player/state/StatePlayerRecyclerViewAssembler.kt
index 1e7656491e2..29f897fd0d0 100644
--- a/app/src/main/java/org/oppia/android/app/player/state/StatePlayerRecyclerViewAssembler.kt
+++ b/app/src/main/java/org/oppia/android/app/player/state/StatePlayerRecyclerViewAssembler.kt
@@ -31,6 +31,7 @@ import org.oppia.android.app.databinding.databinding.LessonProgressIndicatorItem
 import org.oppia.android.app.databinding.databinding.MathExpressionInteractionsItemBinding
 import org.oppia.android.app.databinding.databinding.MultipleChoiceSubmittedAnswerItemsBinding
 import org.oppia.android.app.databinding.databinding.NextButtonItemBinding
+import org.oppia.android.app.databinding.databinding.NumberWithUnitsInputInteractionItemBinding
 import org.oppia.android.app.databinding.databinding.NumericInputInteractionItemBinding
 import org.oppia.android.app.databinding.databinding.PreviousButtonItemBinding
 import org.oppia.android.app.databinding.databinding.PreviousResponsesHeaderItemBinding
@@ -74,6 +75,7 @@ import org.oppia.android.app.player.state.itemviewmodel.ImageRegionSelectionInte
 import org.oppia.android.app.player.state.itemviewmodel.LessonProgressViewModel
 import org.oppia.android.app.player.state.itemviewmodel.MathExpressionInteractionsViewModel
 import org.oppia.android.app.player.state.itemviewmodel.NextButtonViewModel
+import org.oppia.android.app.player.state.itemviewmodel.NumberWithUnitsInputViewModel
 import org.oppia.android.app.player.state.itemviewmodel.NumericInputViewModel
 import org.oppia.android.app.player.state.itemviewmodel.PreviousButtonViewModel
 import org.oppia.android.app.player.state.itemviewmodel.PreviousResponsesHeaderViewModel
@@ -1455,6 +1457,11 @@ class StatePlayerRecyclerViewAssembler private constructor(
         inflateDataBinding = TextInputInteractionItemBinding::inflate,
         setViewModel = TextInputInteractionItemBinding::setViewModel,
         transformViewModel = { it as TextInputViewModel }
+      ).registerViewDataBinder(
+        viewType = StateItemViewModel.ViewType.NUMBER_WITH_UNITS_INPUT_INTERACTION,
+        inflateDataBinding = NumberWithUnitsInputInteractionItemBinding::inflate,
+        setViewModel = NumberWithUnitsInputInteractionItemBinding::setViewModel,
+        transformViewModel = { it as NumberWithUnitsInputViewModel }
       ).registerViewDataBinder(
         viewType = StateItemViewModel.ViewType.RATIO_EXPRESSION_INPUT_INTERACTION,
         inflateDataBinding = RatioInputInteractionItemBinding::inflate,
diff --git a/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/InteractionViewModelModule.kt b/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/InteractionViewModelModule.kt
index 51ea00e2e6e..aefb73264a0 100644
--- a/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/InteractionViewModelModule.kt
+++ b/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/InteractionViewModelModule.kt
@@ -77,6 +77,13 @@ interface InteractionViewModelModule {
     factoryImpl: RatioExpressionInputInteractionViewModel.FactoryImpl
   ): StateItemViewModel.InteractionItemFactory
 
+  @Binds
+  @IntoMap
+  @StringKey("NumberWithUnits")
+  fun provideNumberWithUnitsInputViewModelFactory(
+    factoryImpl: NumberWithUnitsInputViewModel.FactoryImpl
+  ): StateItemViewModel.InteractionItemFactory
+
   // Note that Dagger doesn't support mixing binds & provides methods. See
   // https://stackoverflow.com/a/54592300 for the origin of this approach.
   @Module
diff --git a/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/NumberWithUnitsInputViewModel.kt b/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/NumberWithUnitsInputViewModel.kt
new file mode 100644
index 00000000000..8521454dba2
--- /dev/null
+++ b/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/NumberWithUnitsInputViewModel.kt
@@ -0,0 +1,185 @@
+package org.oppia.android.app.player.state.itemviewmodel
+
+import android.text.Editable
+import android.text.TextWatcher
+import androidx.annotation.StringRes
+import androidx.databinding.Observable
+import androidx.databinding.ObservableField
+import org.oppia.android.app.model.AnswerAndResponse
+import org.oppia.android.app.model.AnswerErrorCategory
+import org.oppia.android.app.model.Interaction
+import org.oppia.android.app.model.InteractionObject
+import org.oppia.android.app.model.UserAnswer
+import org.oppia.android.app.model.UserAnswerState
+import org.oppia.android.app.model.WrittenTranslationContext
+import org.oppia.android.app.player.state.answerhandling.InteractionAnswerErrorOrAvailabilityCheckReceiver
+import org.oppia.android.app.player.state.answerhandling.InteractionAnswerHandler
+import org.oppia.android.app.player.state.answerhandling.InteractionAnswerReceiver
+import org.oppia.android.app.translation.AppLanguageResourceHandler
+import org.oppia.android.app.view.models.R
+import org.oppia.android.domain.translation.TranslationController
+import javax.inject.Inject
+
+/** [StateItemViewModel] for the number with units input interaction. */
+class NumberWithUnitsInputViewModel private constructor(
+  interaction: Interaction,
+  val hasConversationView: Boolean,
+  private val interactionAnswerErrorOrAvailabilityCheckReceiver: InteractionAnswerErrorOrAvailabilityCheckReceiver, // ktlint-disable max-line-length
+  val isSplitView: Boolean,
+  private val writtenTranslationContext: WrittenTranslationContext,
+  private val resourceHandler: AppLanguageResourceHandler,
+  private val translationController: TranslationController,
+  userAnswerState: UserAnswerState
+) : StateItemViewModel(ViewType.NUMBER_WITH_UNITS_INPUT_INTERACTION), InteractionAnswerHandler {
+  var answerText: CharSequence = userAnswerState.textInputAnswer
+  private var answerErrorCategory: AnswerErrorCategory = AnswerErrorCategory.NO_ERROR
+  val hintText: CharSequence = deriveHintText(interaction)
+  private var pendingAnswerError: String? = null
+
+  var isAnswerAvailable = ObservableField<Boolean>(false)
+  val errorMessage = ObservableField<String>("")
+
+  init {
+    val callback: Observable.OnPropertyChangedCallback =
+      object : Observable.OnPropertyChangedCallback() {
+        override fun onPropertyChanged(sender: Observable, propertyId: Int) {
+          interactionAnswerErrorOrAvailabilityCheckReceiver.onPendingAnswerErrorOrAvailabilityCheck(
+            pendingAnswerError = pendingAnswerError,
+            inputAnswerAvailable = true // Allow submit on empty answer.
+          )
+        }
+      }
+    isAnswerAvailable.addOnPropertyChangedCallback(callback)
+    errorMessage.addOnPropertyChangedCallback(callback)
+
+    // Initializing with default values so that submit button is enabled by default.
+    interactionAnswerErrorOrAvailabilityCheckReceiver.onPendingAnswerErrorOrAvailabilityCheck(
+      pendingAnswerError = null,
+      inputAnswerAvailable = true
+    )
+    checkPendingAnswerError(userAnswerState.answerErrorCategory)
+  }
+
+  override fun checkPendingAnswerError(category: AnswerErrorCategory): String? {
+    answerErrorCategory = category
+    return when (category) {
+      AnswerErrorCategory.REAL_TIME -> null
+      AnswerErrorCategory.SUBMIT_TIME -> {
+        TextParsingUiError.createForText(
+          answerText.toString()
+        ).createForText(resourceHandler)
+      }
+      else -> null
+    }.also {
+      pendingAnswerError = it
+      errorMessage.set(it)
+    }
+  }
+
+  fun getAnswerTextWatcher(): TextWatcher {
+    return object : TextWatcher {
+      override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {
+      }
+
+      override fun onTextChanged(answer: CharSequence, start: Int, before: Int, count: Int) {
+        answerText = answer.toString().trim()
+        val isAnswerTextAvailable = answerText.isNotEmpty()
+        if (isAnswerTextAvailable != isAnswerAvailable.get()) {
+          isAnswerAvailable.set(isAnswerTextAvailable)
+        }
+        checkPendingAnswerError(AnswerErrorCategory.REAL_TIME)
+      }
+
+      override fun afterTextChanged(s: Editable) {
+      }
+    }
+  }
+
+  override fun getPendingAnswer(): UserAnswer = UserAnswer.newBuilder().apply {
+    if (answerText.isNotEmpty()) {
+      val answerTextString = answerText.toString()
+      answer = InteractionObject.newBuilder().apply {
+        normalizedString = answerTextString
+      }.build()
+      plainAnswer = answerTextString
+      writtenTranslationContext = this@NumberWithUnitsInputViewModel.writtenTranslationContext
+    }
+  }.build()
+
+  override fun getUserAnswerState(): UserAnswerState {
+    return UserAnswerState.newBuilder().apply {
+      this.textInputAnswer = answerText.toString()
+      this.answerErrorCategory = answerErrorCategory
+    }.build()
+  }
+
+  private fun deriveHintText(interaction: Interaction): CharSequence {
+    // The subtitled unicode can apparently exist in the structure in two different formats.
+    val placeholderUnicodeOption1 =
+      interaction.customizationArgsMap["placeholder"]?.subtitledUnicode
+    val placeholderUnicodeOption2 =
+      interaction.customizationArgsMap["placeholder"]?.customSchemaValue?.subtitledUnicode
+    val placeholder1 =
+      placeholderUnicodeOption1?.let { unicode ->
+        translationController.extractString(unicode, writtenTranslationContext)
+      } ?: ""
+    val placeholder2 =
+      placeholderUnicodeOption2?.let { unicode ->
+        translationController.extractString(unicode, writtenTranslationContext)
+      } ?: "" // The default placeholder for text input is empty.
+    return when {
+      placeholder1.isNotEmpty() -> placeholder1
+      placeholder2.isNotEmpty() -> placeholder2
+      else -> resourceHandler.getStringInLocale(R.string.number_with_units_input_hint_text)
+    }
+  }
+
+  /** Implementation of [StateItemViewModel.InteractionItemFactory] for this view model. */
+  class FactoryImpl @Inject constructor(
+    private val resourceHandler: AppLanguageResourceHandler,
+    private val translationController: TranslationController
+  ) : InteractionItemFactory {
+    override fun create(
+      entityId: String,
+      hasConversationView: Boolean,
+      interaction: Interaction,
+      interactionAnswerReceiver: InteractionAnswerReceiver,
+      answerErrorReceiver: InteractionAnswerErrorOrAvailabilityCheckReceiver,
+      hasPreviousButton: Boolean,
+      isSplitView: Boolean,
+      writtenTranslationContext: WrittenTranslationContext,
+      timeToStartNoticeAnimationMs: Long?,
+      userAnswerState: UserAnswerState,
+      wrongAnswerList: List<AnswerAndResponse>
+    ): StateItemViewModel {
+      return NumberWithUnitsInputViewModel(
+        interaction,
+        hasConversationView,
+        answerErrorReceiver,
+        isSplitView,
+        writtenTranslationContext,
+        resourceHandler,
+        translationController,
+        userAnswerState
+      )
+    }
+  }
+
+  private enum class TextParsingUiError(@StringRes private var error: Int?) {
+    /** Corresponds to non empty input. */
+    VALID(error = null),
+
+    /** Corresponds to empty input. */
+    EMPTY_INPUT(error = R.string.text_error_empty_input);
+
+    /** Returns the string corresponding to this error's string resources, or null if there is none. */
+    fun createForText(resourceHandler: AppLanguageResourceHandler): String? =
+      error?.let(resourceHandler::getStringInLocale)
+
+    companion object {
+      /** Returns the [TextParsingUiError] corresponding to the input. */
+      fun createForText(text: String): TextParsingUiError =
+        if (text.isEmpty()) EMPTY_INPUT else VALID
+    }
+  }
+}
diff --git a/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/StateItemViewModel.kt b/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/StateItemViewModel.kt
index c7f26e82a6e..f3001d3703d 100644
--- a/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/StateItemViewModel.kt
+++ b/app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/StateItemViewModel.kt
@@ -40,7 +40,8 @@ abstract class StateItemViewModel(val viewType: ViewType) : ObservableViewModel(
     FLASHBACK_BUTTON,
     RETURN_TO_QUESTION_BUTTON,
     FLASHBACK_SOLUTION,
-    LESSON_PROGRESS_INDICATOR
+    LESSON_PROGRESS_INDICATOR,
+    NUMBER_WITH_UNITS_INPUT_INTERACTION
   }
 
   /** Factory for creating new [StateItemViewModel]s for interactions. */
diff --git a/app/src/main/java/org/oppia/android/app/testing/NumberWithUnitsInputInteractionViewTestActivity.kt b/app/src/main/java/org/oppia/android/app/testing/NumberWithUnitsInputInteractionViewTestActivity.kt
new file mode 100644
index 00000000000..3fe2de0660d
--- /dev/null
+++ b/app/src/main/java/org/oppia/android/app/testing/NumberWithUnitsInputInteractionViewTestActivity.kt
@@ -0,0 +1,109 @@
+package org.oppia.android.app.testing
+
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import androidx.databinding.DataBindingUtil
+import org.oppia.android.app.activity.ActivityComponentImpl
+import org.oppia.android.app.activity.InjectableAutoLocalizedAppCompatActivity
+import org.oppia.android.app.customview.interaction.NumberWithUnitsInputInteractionView
+import org.oppia.android.app.databinding.databinding.ActivityNumberWithUnitsInputInteractionViewTestBinding
+import org.oppia.android.app.model.AnswerErrorCategory
+import org.oppia.android.app.model.InputInteractionViewTestActivityParams
+import org.oppia.android.app.model.Interaction
+import org.oppia.android.app.model.UserAnswer
+import org.oppia.android.app.model.WrittenTranslationContext
+import org.oppia.android.app.player.state.answerhandling.InteractionAnswerErrorOrAvailabilityCheckReceiver
+import org.oppia.android.app.player.state.answerhandling.InteractionAnswerReceiver
+import org.oppia.android.app.player.state.itemviewmodel.NumberWithUnitsInputViewModel
+import org.oppia.android.app.player.state.itemviewmodel.StateItemViewModel
+import org.oppia.android.app.player.state.itemviewmodel.StateItemViewModel.InteractionItemFactory
+import org.oppia.android.app.player.state.listener.StateKeyboardButtonListener
+import org.oppia.android.app.ui.R
+import org.oppia.android.util.extensions.getProtoExtra
+import org.oppia.android.util.extensions.putProtoExtra
+import javax.inject.Inject
+
+/**
+ * This is a dummy activity to test [NumberWithUnitsInputInteractionView].
+ */
+class NumberWithUnitsInputInteractionViewTestActivity :
+  InjectableAutoLocalizedAppCompatActivity(),
+  StateKeyboardButtonListener,
+  InteractionAnswerErrorOrAvailabilityCheckReceiver,
+  InteractionAnswerReceiver {
+  private lateinit var binding: ActivityNumberWithUnitsInputInteractionViewTestBinding
+
+  @Inject
+  lateinit var numberWithUnitsInputViewModelFactory: NumberWithUnitsInputViewModel.FactoryImpl
+
+  /** Gives access to the [NumberWithUnitsInputViewModel]. */
+  val numberWithUnitsInputViewModel by lazy {
+    numberWithUnitsInputViewModelFactory.create<NumberWithUnitsInputViewModel>()
+  }
+
+  /** Gives access to the translation context. */
+  lateinit var writtenTranslationContext: WrittenTranslationContext
+
+  override fun onCreate(savedInstanceState: Bundle?) {
+    super.onCreate(savedInstanceState)
+    (activityComponent as ActivityComponentImpl).inject(this)
+    binding = DataBindingUtil
+      .setContentView<ActivityNumberWithUnitsInputInteractionViewTestBinding>(
+        this, R.layout.activity_number_with_units_input_interaction_view_test
+      )
+
+    val params =
+      intent.getProtoExtra(
+        TEST_ACTIVITY_PARAMS_ARGUMENT_KEY,
+        InputInteractionViewTestActivityParams.getDefaultInstance()
+      )
+    writtenTranslationContext = params.writtenTranslationContext
+
+    binding.numberWithUnitsInputViewModel = numberWithUnitsInputViewModel
+    binding.getPendingAnswerErrorOnSubmitClick = Runnable {
+      numberWithUnitsInputViewModel.checkPendingAnswerError(AnswerErrorCategory.SUBMIT_TIME)
+    }
+  }
+
+  override fun onPendingAnswerErrorOrAvailabilityCheck(
+    pendingAnswerError: String?,
+    inputAnswerAvailable: Boolean
+  ) {
+  }
+
+  override fun onAnswerReadyForSubmission(answer: UserAnswer) { }
+
+  override fun onEditorAction(actionCode: Int) { }
+
+  private inline fun <reified T : StateItemViewModel> InteractionItemFactory.create(
+    interaction: Interaction = Interaction.getDefaultInstance()
+  ): T {
+    return create(
+      entityId = "fake_entity_id",
+      hasConversationView = false,
+      interaction = interaction,
+      interactionAnswerReceiver = this@NumberWithUnitsInputInteractionViewTestActivity,
+      answerErrorReceiver = this@NumberWithUnitsInputInteractionViewTestActivity,
+      hasPreviousButton = false,
+      isSplitView = false,
+      writtenTranslationContext,
+      timeToStartNoticeAnimationMs = null
+    ) as T
+  }
+
+  companion object {
+    private const val TEST_ACTIVITY_PARAMS_ARGUMENT_KEY =
+      "NumberWithUnitsInputInteractionViewTestActivity.params"
+
+    /** Creates an intent to open [NumberWithUnitsInputInteractionViewTestActivity]. */
+    fun createIntent(
+      context: Context,
+      extras: InputInteractionViewTestActivityParams
+    ): Intent {
+      return Intent(context, NumberWithUnitsInputInteractionViewTestActivity::class.java).also {
+        it.putProtoExtra(TEST_ACTIVITY_PARAMS_ARGUMENT_KEY, extras)
+      }
+    }
+  }
+}
diff --git a/app/src/main/res/layout/activity_number_with_units_input_interaction_view_test.xml b/app/src/main/res/layout/activity_number_with_units_input_interaction_view_test.xml
new file mode 100644
index 00000000000..4f7bb4ada9f
--- /dev/null
+++ b/app/src/main/res/layout/activity_number_with_units_input_interaction_view_test.xml
@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:app="http://schemas.android.com/apk/res-auto"
+  xmlns:tools="http://schemas.android.com/tools">
+
+  <data>
+
+    <import type="android.view.View" />
+
+    <variable
+      name="numberWithUnitsInputViewModel"
+      type="org.oppia.android.app.player.state.itemviewmodel.NumberWithUnitsInputViewModel" />
+
+    <variable
+      name="getPendingAnswerErrorOnSubmitClick"
+      type="java.lang.Runnable" />
+  </data>
+
+  <ScrollView
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+    <LinearLayout
+      android:layout_width="match_parent"
+      android:layout_height="wrap_content"
+      android:descendantFocusability="beforeDescendants"
+      android:focusableInTouchMode="true"
+      android:gravity="center"
+      android:orientation="vertical"
+      tools:context=".testing.NumberWithUnitsInputInteractionViewTestActivity">
+
+      <org.oppia.android.app.customview.interaction.NumberWithUnitsInputInteractionView
+        android:id="@+id/test_number_with_units_input_interaction_view"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_margin="8dp"
+        android:background="@drawable/edit_text_background"
+        android:fontFamily="sans-serif"
+        android:hint="@{numberWithUnitsInputViewModel.hintText}"
+        android:imeOptions="actionDone"
+        android:longClickable="false"
+        android:maxLength="200"
+        android:minHeight="48dp"
+        android:paddingStart="16dp"
+        android:paddingEnd="16dp"
+        android:paddingBottom="8dp"
+        android:singleLine="true"
+        android:text="@={numberWithUnitsInputViewModel.answerText}"
+        android:textColor="@color/component_color_shared_primary_text_color"
+        android:textColorHint="@color/component_color_shared_edit_text_hint_color"
+        android:textSize="14sp"
+        android:textStyle="italic"
+        app:textChangedListener="@{numberWithUnitsInputViewModel.answerTextWatcher}" />
+
+      <TextView
+        android:id="@+id/number_with_units_input_error"
+        style="@style/TextViewStart"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginEnd="8dp"
+        android:fontFamily="sans-serif"
+        android:minHeight="32dp"
+        android:text="@{numberWithUnitsInputViewModel.errorMessage}"
+        android:textColor="@color/component_color_shared_input_error_color"
+        android:textSize="12sp"
+        android:visibility="@{numberWithUnitsInputViewModel.errorMessage.length() > 0 ? View.VISIBLE : View.INVISIBLE}" />
+
+      <Button
+        android:id="@+id/submit_button"
+        style="@style/StateButtonActive"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_margin="8dp"
+        android:onClick="@{(v) -> getPendingAnswerErrorOnSubmitClick.run()}"
+        android:text="@string/submit_button_text"
+        android:textColor="@color/component_color_shared_secondary_4_text_color" />
+    </LinearLayout>
+  </ScrollView>
+</layout>
+
diff --git a/app/src/main/res/layout/number_with_units_input_interaction_item.xml b/app/src/main/res/layout/number_with_units_input_interaction_item.xml
new file mode 100644
index 00000000000..42bc3560962
--- /dev/null
+++ b/app/src/main/res/layout/number_with_units_input_interaction_item.xml
@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:app="http://schemas.android.com/apk/res-auto"
+  xmlns:tools="http://schemas.android.com/tools">
+
+  <data>
+
+    <import type="android.view.View" />
+
+    <variable
+      name="viewModel"
+      type="org.oppia.android.app.player.state.itemviewmodel.NumberWithUnitsInputViewModel" />
+  </data>
+
+  <androidx.constraintlayout.widget.ConstraintLayout
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:descendantFocusability="beforeDescendants"
+    android:focusableInTouchMode="true"
+    android:paddingStart="@{viewModel.hasConversationView ? @dimen/interaction_item_exploration_view_padding_start : @dimen/interaction_item_question_view_padding_start}"
+    android:paddingEnd="@{viewModel.hasConversationView ?@dimen/interaction_item_exploration_view_padding_end : @dimen/interaction_item_question_view_padding_end}"
+    app:layoutMarginTop="@{viewModel.hasConversationView ? @dimen/interaction_item_exploration_view_margin_top : @dimen/interaction_item_question_view_margin_top}">
+
+    <org.oppia.android.app.customview.interaction.NumberWithUnitsInputInteractionView
+      android:id="@+id/text_input_interaction_view"
+      style="@style/InputInteractionEditText"
+      android:contentDescription="@{viewModel.hintText.length() == 0 ? @string/text_input_default_content_description : ``}"
+      android:hint="@{viewModel.hintText}"
+      android:inputType="text"
+      android:text="@={viewModel.answerText}"
+      android:textColorHint="@color/component_color_shared_edit_text_hint_color"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toTopOf="parent"
+      app:textChangedListener="@{viewModel.answerTextWatcher}"
+      tools:ignore="ContentDescription" />
+
+    <TextView
+      android:id="@+id/text_input_error"
+      style="@style/InputInteractionErrorTextView"
+      android:text="@{viewModel.errorMessage}"
+      android:textColor="@color/component_color_shared_input_error_color"
+      android:visibility="@{viewModel.errorMessage.length()>0? View.VISIBLE : View.GONE}"
+      app:layout_constraintEnd_toEndOf="parent"
+      app:layout_constraintStart_toStartOf="parent"
+      app:layout_constraintTop_toBottomOf="@+id/text_input_interaction_view" />
+  </androidx.constraintlayout.widget.ConstraintLayout>
+</layout>
diff --git a/app/src/sharedTest/java/org/oppia/android/app/devoptions/markchapterscompleted/MarkChaptersCompletedFragmentTest.kt b/app/src/sharedTest/java/org/oppia/android/app/devoptions/markchapterscompleted/MarkChaptersCompletedFragmentTest.kt
index e0a6e533cdd..8f0e4519f58 100644
--- a/app/src/sharedTest/java/org/oppia/android/app/devoptions/markchapterscompleted/MarkChaptersCompletedFragmentTest.kt
+++ b/app/src/sharedTest/java/org/oppia/android/app/devoptions/markchapterscompleted/MarkChaptersCompletedFragmentTest.kt
@@ -166,17 +166,17 @@ class MarkChaptersCompletedFragmentTest {
         targetViewId = R.id.mark_chapters_completed_story_name_text_view
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 6,
+        itemPosition = 7,
         stringToMatch = "Matthew Goes to the Bakery",
         targetViewId = R.id.mark_chapters_completed_story_name_text_view
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 9,
+        itemPosition = 10,
         stringToMatch = "Ratios: Part 1",
         targetViewId = R.id.mark_chapters_completed_story_name_text_view
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 12,
+        itemPosition = 13,
         stringToMatch = "Ratios: Part 2",
         targetViewId = R.id.mark_chapters_completed_story_name_text_view
       )
@@ -199,17 +199,17 @@ class MarkChaptersCompletedFragmentTest {
         targetViewId = R.id.mark_chapters_completed_story_name_text_view
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 6,
+        itemPosition = 7,
         stringToMatch = "Matthew Goes to the Bakery",
         targetViewId = R.id.mark_chapters_completed_story_name_text_view
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 9,
+        itemPosition = 10,
         stringToMatch = "Ratios: Part 1",
         targetViewId = R.id.mark_chapters_completed_story_name_text_view
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 12,
+        itemPosition = 13,
         stringToMatch = "Ratios: Part 2",
         targetViewId = R.id.mark_chapters_completed_story_name_text_view
       )
@@ -241,32 +241,37 @@ class MarkChaptersCompletedFragmentTest {
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 7,
-        stringToMatch = "What is a Fraction?",
+        itemPosition = 6,
+        stringToMatch = "Number With Units Exploration",
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
         itemPosition = 8,
+        stringToMatch = "What is a Fraction?",
+        targetViewId = R.id.mark_chapters_completed_chapter_check_box
+      )
+      verifyItemTextOnRecyclerViewItemAtPosition(
+        itemPosition = 9,
         stringToMatch = "The Meaning of Equal Parts",
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 10,
+        itemPosition = 11,
         stringToMatch = "What is a Ratio?",
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 11,
+        itemPosition = 12,
         stringToMatch = "Order is important",
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 13,
+        itemPosition = 14,
         stringToMatch = "Equivalent Ratios",
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 14,
+        itemPosition = 15,
         stringToMatch = "Writing Ratios in Simplest Form",
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
@@ -299,32 +304,37 @@ class MarkChaptersCompletedFragmentTest {
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 7,
-        stringToMatch = "What is a Fraction?",
+        itemPosition = 6,
+        stringToMatch = "Number With Units Exploration",
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
         itemPosition = 8,
+        stringToMatch = "What is a Fraction?",
+        targetViewId = R.id.mark_chapters_completed_chapter_check_box
+      )
+      verifyItemTextOnRecyclerViewItemAtPosition(
+        itemPosition = 9,
         stringToMatch = "The Meaning of Equal Parts",
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 10,
+        itemPosition = 11,
         stringToMatch = "What is a Ratio?",
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 11,
+        itemPosition = 12,
         stringToMatch = "Order is important",
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 13,
+        itemPosition = 14,
         stringToMatch = "Equivalent Ratios",
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
       verifyItemTextOnRecyclerViewItemAtPosition(
-        itemPosition = 14,
+        itemPosition = 15,
         stringToMatch = "Writing Ratios in Simplest Form",
         targetViewId = R.id.mark_chapters_completed_chapter_check_box
       )
@@ -359,12 +369,13 @@ class MarkChaptersCompletedFragmentTest {
       verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 2)
       verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 3)
       verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 5)
-      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 7)
+      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 6)
       verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 8)
-      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 10)
+      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 9)
       verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 11)
-      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 13)
+      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 12)
       verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 14)
+      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 15)
     }
   }
 
@@ -380,12 +391,13 @@ class MarkChaptersCompletedFragmentTest {
       verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 2)
       verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 3)
       verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 5)
-      verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 7)
+      verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 6)
       verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 8)
-      verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 10)
+      verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 9)
       verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 11)
-      verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 13)
+      verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 12)
       verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 14)
+      verifyItemUncheckedOnRecyclerViewItemAtPosition(itemPosition = 15)
       testCoroutineDispatchers.runCurrent()
       onView(withId(R.id.mark_chapters_completed_all_check_box)).check(matches(not(isChecked())))
     }
@@ -401,12 +413,13 @@ class MarkChaptersCompletedFragmentTest {
       verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 2)
       verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 3)
       verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 5)
-      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 7)
+      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 6)
       verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 8)
-      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 10)
+      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 9)
       verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 11)
-      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 13)
+      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 12)
       verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 14)
+      verifyItemCheckedOnRecyclerViewItemAtPosition(itemPosition = 15)
     }
   }
 
@@ -523,12 +536,13 @@ class MarkChaptersCompletedFragmentTest {
       clickOnRecyclerViewItemAtPosition(itemPosition = 2)
       clickOnRecyclerViewItemAtPosition(itemPosition = 3)
       clickOnRecyclerViewItemAtPosition(itemPosition = 5)
-      clickOnRecyclerViewItemAtPosition(itemPosition = 7)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 6)
       clickOnRecyclerViewItemAtPosition(itemPosition = 8)
-      clickOnRecyclerViewItemAtPosition(itemPosition = 10)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 9)
       clickOnRecyclerViewItemAtPosition(itemPosition = 11)
-      clickOnRecyclerViewItemAtPosition(itemPosition = 13)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 12)
       clickOnRecyclerViewItemAtPosition(itemPosition = 14)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 15)
       onView(withId(R.id.mark_chapters_completed_all_check_box)).check(matches(isChecked()))
     }
   }
@@ -541,12 +555,13 @@ class MarkChaptersCompletedFragmentTest {
       clickOnRecyclerViewItemAtPosition(itemPosition = 2)
       clickOnRecyclerViewItemAtPosition(itemPosition = 3)
       clickOnRecyclerViewItemAtPosition(itemPosition = 5)
-      clickOnRecyclerViewItemAtPosition(itemPosition = 7)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 6)
       clickOnRecyclerViewItemAtPosition(itemPosition = 8)
-      clickOnRecyclerViewItemAtPosition(itemPosition = 10)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 9)
       clickOnRecyclerViewItemAtPosition(itemPosition = 11)
-      clickOnRecyclerViewItemAtPosition(itemPosition = 13)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 12)
       clickOnRecyclerViewItemAtPosition(itemPosition = 14)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 15)
       onView(isRoot()).perform(orientationLandscape())
       onView(withId(R.id.mark_chapters_completed_all_check_box)).check(matches(isChecked()))
     }
@@ -560,12 +575,13 @@ class MarkChaptersCompletedFragmentTest {
       clickOnRecyclerViewItemAtPosition(itemPosition = 2)
       clickOnRecyclerViewItemAtPosition(itemPosition = 3)
       clickOnRecyclerViewItemAtPosition(itemPosition = 5)
-      clickOnRecyclerViewItemAtPosition(itemPosition = 7)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 6)
       clickOnRecyclerViewItemAtPosition(itemPosition = 8)
-      clickOnRecyclerViewItemAtPosition(itemPosition = 10)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 9)
       clickOnRecyclerViewItemAtPosition(itemPosition = 11)
-      clickOnRecyclerViewItemAtPosition(itemPosition = 13)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 12)
       clickOnRecyclerViewItemAtPosition(itemPosition = 14)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 15)
       clickOnRecyclerViewItemAtPosition(itemPosition = 2)
       onView(withId(R.id.mark_chapters_completed_all_check_box)).check(matches(not(isChecked())))
     }
@@ -579,12 +595,13 @@ class MarkChaptersCompletedFragmentTest {
       clickOnRecyclerViewItemAtPosition(itemPosition = 2)
       clickOnRecyclerViewItemAtPosition(itemPosition = 3)
       clickOnRecyclerViewItemAtPosition(itemPosition = 5)
-      clickOnRecyclerViewItemAtPosition(itemPosition = 7)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 6)
       clickOnRecyclerViewItemAtPosition(itemPosition = 8)
-      clickOnRecyclerViewItemAtPosition(itemPosition = 10)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 9)
       clickOnRecyclerViewItemAtPosition(itemPosition = 11)
-      clickOnRecyclerViewItemAtPosition(itemPosition = 13)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 12)
       clickOnRecyclerViewItemAtPosition(itemPosition = 14)
+      clickOnRecyclerViewItemAtPosition(itemPosition = 15)
       clickOnRecyclerViewItemAtPosition(itemPosition = 2)
       onView(isRoot()).perform(orientationLandscape())
       onView(withId(R.id.mark_chapters_completed_all_check_box)).check(matches(not(isChecked())))
@@ -596,11 +613,11 @@ class MarkChaptersCompletedFragmentTest {
     markFractionsFirstChapterCompleted()
     launchMarkChaptersCompletedFragmentTestActivity(internalProfileId).use {
       testCoroutineDispatchers.runCurrent()
-      scrollToPosition(position = 7)
+      scrollToPosition(position = 8)
       onView(
         atPositionOnView(
           recyclerViewId = R.id.mark_chapters_completed_recycler_view,
-          position = 7,
+          position = 8,
           targetViewId = R.id.mark_chapters_completed_chapter_check_box
         )
       ).check(matches(isChecked())).check(matches(not(isEnabled())))
@@ -613,11 +630,11 @@ class MarkChaptersCompletedFragmentTest {
     launchMarkChaptersCompletedFragmentTestActivity(internalProfileId).use {
       testCoroutineDispatchers.runCurrent()
       onView(isRoot()).perform(orientationLandscape())
-      scrollToPosition(position = 7)
+      scrollToPosition(position = 8)
       onView(
         atPositionOnView(
           recyclerViewId = R.id.mark_chapters_completed_recycler_view,
-          position = 7,
+          position = 8,
           targetViewId = R.id.mark_chapters_completed_chapter_check_box
         )
       ).check(matches(isChecked())).check(matches(not(isEnabled())))
@@ -629,11 +646,11 @@ class MarkChaptersCompletedFragmentTest {
     markFractionsFirstChapterCompleted()
     launchMarkChaptersCompletedFragmentTestActivity(internalProfileId).use {
       testCoroutineDispatchers.runCurrent()
-      scrollToPosition(position = 8)
+      scrollToPosition(position = 9)
       onView(
         atPositionOnView(
           recyclerViewId = R.id.mark_chapters_completed_recycler_view,
-          position = 8,
+          position = 9,
           targetViewId = R.id.mark_chapters_completed_chapter_check_box
         )
       ).check(matches(isEnabled()))
@@ -646,11 +663,11 @@ class MarkChaptersCompletedFragmentTest {
     launchMarkChaptersCompletedFragmentTestActivity(internalProfileId).use {
       testCoroutineDispatchers.runCurrent()
       onView(isRoot()).perform(orientationLandscape())
-      scrollToPosition(position = 8)
+      scrollToPosition(position = 9)
       onView(
         atPositionOnView(
           recyclerViewId = R.id.mark_chapters_completed_recycler_view,
-          position = 8,
+          position = 9,
           targetViewId = R.id.mark_chapters_completed_chapter_check_box
         )
       ).check(matches(isEnabled()))
diff --git a/app/src/sharedTest/java/org/oppia/android/app/testing/NumberWithUnitsInputInteractionViewTestActivityTest.kt b/app/src/sharedTest/java/org/oppia/android/app/testing/NumberWithUnitsInputInteractionViewTestActivityTest.kt
new file mode 100644
index 00000000000..aa8ec733a62
--- /dev/null
+++ b/app/src/sharedTest/java/org/oppia/android/app/testing/NumberWithUnitsInputInteractionViewTestActivityTest.kt
@@ -0,0 +1,294 @@
+package org.oppia.android.app.testing
+
+import android.app.Application
+import android.content.res.Configuration
+import androidx.appcompat.app.AppCompatActivity
+import androidx.test.core.app.ActivityScenario
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.espresso.Espresso.onView
+import androidx.test.espresso.action.ViewActions.click
+import androidx.test.espresso.action.ViewActions.scrollTo
+import androidx.test.espresso.assertion.ViewAssertions.matches
+import androidx.test.espresso.matcher.ViewMatchers.isDisplayed
+import androidx.test.espresso.matcher.ViewMatchers.withId
+import androidx.test.espresso.matcher.ViewMatchers.withText
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.google.common.truth.Truth.assertThat
+import dagger.Component
+import org.junit.After
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.oppia.android.app.activity.ActivityComponent
+import org.oppia.android.app.activity.ActivityComponentFactory
+import org.oppia.android.app.activity.route.ActivityRouterModule
+import org.oppia.android.app.application.ApplicationComponent
+import org.oppia.android.app.application.ApplicationInjector
+import org.oppia.android.app.application.ApplicationInjectorProvider
+import org.oppia.android.app.application.ApplicationModule
+import org.oppia.android.app.application.ApplicationStartupListenerModule
+import org.oppia.android.app.application.testing.TestingBuildFlavorModule
+import org.oppia.android.app.devoptions.DeveloperOptionsModule
+import org.oppia.android.app.devoptions.DeveloperOptionsStarterModule
+import org.oppia.android.app.model.InteractionObject
+import org.oppia.android.app.player.state.itemviewmodel.SplitScreenInteractionModule
+import org.oppia.android.app.shim.ViewBindingShimModule
+import org.oppia.android.app.test.R
+import org.oppia.android.app.translation.testing.ActivityRecreatorTestModule
+import org.oppia.android.data.backends.gae.NetworkConfigProdModule
+import org.oppia.android.data.backends.gae.RetrofitModule
+import org.oppia.android.data.backends.gae.RetrofitServiceModule
+import org.oppia.android.domain.classify.InteractionsModule
+import org.oppia.android.domain.classify.rules.algebraicexpressioninput.AlgebraicExpressionInputModule
+import org.oppia.android.domain.classify.rules.continueinteraction.ContinueModule
+import org.oppia.android.domain.classify.rules.dragAndDropSortInput.DragDropSortInputModule
+import org.oppia.android.domain.classify.rules.fractioninput.FractionInputModule
+import org.oppia.android.domain.classify.rules.imageClickInput.ImageClickInputModule
+import org.oppia.android.domain.classify.rules.itemselectioninput.ItemSelectionInputModule
+import org.oppia.android.domain.classify.rules.mathequationinput.MathEquationInputModule
+import org.oppia.android.domain.classify.rules.multiplechoiceinput.MultipleChoiceInputModule
+import org.oppia.android.domain.classify.rules.numberwithunits.NumberWithUnitsRuleModule
+import org.oppia.android.domain.classify.rules.numericexpressioninput.NumericExpressionInputModule
+import org.oppia.android.domain.classify.rules.numericinput.NumericInputRuleModule
+import org.oppia.android.domain.classify.rules.ratioinput.RatioInputModule
+import org.oppia.android.domain.classify.rules.textinput.TextInputRuleModule
+import org.oppia.android.domain.exploration.ExplorationProgressModule
+import org.oppia.android.domain.exploration.ExplorationStorageModule
+import org.oppia.android.domain.hintsandsolution.HintsAndSolutionConfigModule
+import org.oppia.android.domain.hintsandsolution.HintsAndSolutionProdModule
+import org.oppia.android.domain.onboarding.ExpirationMetaDataRetrieverModule
+import org.oppia.android.domain.oppialogger.LogStorageModule
+import org.oppia.android.domain.oppialogger.LoggingIdentifierModule
+import org.oppia.android.domain.oppialogger.analytics.ApplicationLifecycleModule
+import org.oppia.android.domain.oppialogger.analytics.CpuPerformanceSnapshotterModule
+import org.oppia.android.domain.oppialogger.logscheduler.MetricLogSchedulerModule
+import org.oppia.android.domain.oppialogger.loguploader.LogReportWorkerModule
+import org.oppia.android.domain.platformparameter.PlatformParameterSingletonModule
+import org.oppia.android.domain.question.QuestionModule
+import org.oppia.android.domain.workmanager.WorkManagerConfigurationModule
+import org.oppia.android.testing.DisableAccessibilityChecks
+import org.oppia.android.testing.OppiaTestRule
+import org.oppia.android.testing.TestLogReportingModule
+import org.oppia.android.testing.espresso.EditTextInputAction
+import org.oppia.android.testing.firebase.TestAuthenticationModule
+import org.oppia.android.testing.junit.InitializeDefaultLocaleRule
+import org.oppia.android.testing.platformparameter.TestPlatformParameterModule
+import org.oppia.android.testing.robolectric.RobolectricModule
+import org.oppia.android.testing.threading.TestCoroutineDispatchers
+import org.oppia.android.testing.threading.TestDispatcherModule
+import org.oppia.android.testing.time.FakeOppiaClockModule
+import org.oppia.android.util.accessibility.AccessibilityTestModule
+import org.oppia.android.util.caching.AssetModule
+import org.oppia.android.util.caching.testing.CachingTestModule
+import org.oppia.android.util.gcsresource.GcsResourceModule
+import org.oppia.android.util.locale.LocaleProdModule
+import org.oppia.android.util.logging.LoggerModule
+import org.oppia.android.util.logging.SyncStatusModule
+import org.oppia.android.util.logging.firebase.FirebaseLogUploaderModule
+import org.oppia.android.util.networking.NetworkConnectionDebugUtilModule
+import org.oppia.android.util.networking.NetworkConnectionUtilDebugModule
+import org.oppia.android.util.parser.html.HtmlParserEntityTypeModule
+import org.oppia.android.util.parser.image.GlideImageLoaderModule
+import org.oppia.android.util.parser.image.ImageParsingModule
+import org.robolectric.annotation.Config
+import org.robolectric.annotation.LooperMode
+import javax.inject.Inject
+import javax.inject.Singleton
+
+/** Tests for [NumberWithUnitsInputInteractionViewTestActivity]. */
+@RunWith(AndroidJUnit4::class)
+@LooperMode(LooperMode.Mode.PAUSED)
+@Config(
+  application = NumberWithUnitsInputInteractionViewTestActivityTest.TestApplication::class,
+  qualifiers = "port-xxhdpi"
+)
+class NumberWithUnitsInputInteractionViewTestActivityTest {
+  @get:Rule
+  val initializeDefaultLocaleRule = InitializeDefaultLocaleRule()
+
+  @Inject
+  lateinit var testCoroutineDispatchers: TestCoroutineDispatchers
+
+  @get:Rule
+  val oppiaTestRule = OppiaTestRule()
+
+  @Inject
+  lateinit var editTextInputAction: EditTextInputAction
+
+  @Before
+  fun setUp() {
+    setUpTestApplicationComponent()
+    testCoroutineDispatchers.registerIdlingResource()
+  }
+
+  @After
+  fun tearDown() {
+    testCoroutineDispatchers.unregisterIdlingResource()
+  }
+
+  private fun setUpTestApplicationComponent() {
+    ApplicationProvider.getApplicationContext<TestApplication>().inject(this)
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as NumberWithUnitsInputInteractionViewTestActivity is a
+  // test file and will not be used by user
+  fun testNumberWithUnitsInput_withNoInput_hasCorrectPendingAnswerType() {
+    val activityScenario = ActivityScenario.launch(
+      NumberWithUnitsInputInteractionViewTestActivity::class.java
+    )
+    activityScenario.onActivity { activity ->
+      val pendingAnswer = activity.numberWithUnitsInputViewModel.getPendingAnswer()
+      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
+      assertThat(pendingAnswer.answer.normalizedString).isEmpty()
+    }
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as NumberWithUnitsInputInteractionViewTestActivity is a
+  // test file and will not be used by user
+  fun testNumberWithUnitsInput_withValue_hasCorrectPendingAnswer() {
+    val activityScenario = ActivityScenario.launch(
+      NumberWithUnitsInputInteractionViewTestActivity::class.java
+    )
+    onView(withId(R.id.test_number_with_units_input_interaction_view))
+      .perform(editTextInputAction.appendText("42 km"))
+    activityScenario.onActivity { activity ->
+      val pendingAnswer = activity.numberWithUnitsInputViewModel.getPendingAnswer()
+      assertThat(pendingAnswer.answer).isInstanceOf(InteractionObject::class.java)
+      assertThat(pendingAnswer.answer.objectTypeCase).isEqualTo(
+        InteractionObject.ObjectTypeCase.NORMALIZED_STRING
+      )
+      assertThat(pendingAnswer.answer.normalizedString).isEqualTo("42 km")
+    }
+  }
+
+  @Test
+  fun testNumberWithUnitsInput_withValue_configChange_hasCorrectPendingAnswer() {
+    val activityScenario = ActivityScenario.launch(
+      NumberWithUnitsInputInteractionViewTestActivity::class.java
+    )
+    onView(withId(R.id.test_number_with_units_input_interaction_view))
+      .perform(editTextInputAction.appendText("5 m"))
+    activityScenario.onActivity { activity ->
+      activity.requestedOrientation = Configuration.ORIENTATION_LANDSCAPE
+    }
+    onView(withId(R.id.test_number_with_units_input_interaction_view))
+      .check(matches(isDisplayed()))
+      .check(matches(withText("5 m")))
+  }
+
+  @Test
+  @DisableAccessibilityChecks // Disabled, as NumberWithUnitsInputInteractionViewTestActivity is a
+  // test file and will not be used by user
+  fun testNumberWithUnitsInput_withBlankInput_submit_emptyInputErrorIsDisplayed() {
+    ActivityScenario.launch(NumberWithUnitsInputInteractionViewTestActivity::class.java).use {
+      scrollToSubmitButton()
+      onView(withId(R.id.submit_button)).check(matches(isDisplayed())).perform(click())
+      onView(withId(R.id.number_with_units_input_error))
+        .check(matches(withText(R.string.text_error_empty_input)))
+    }
+  }
+
+  private fun scrollToSubmitButton() {
+    onView(withId(R.id.submit_button)).perform(scrollTo())
+    testCoroutineDispatchers.runCurrent()
+  }
+
+  // TODO(#59): Figure out a way to reuse modules instead of needing to re-declare them.
+  @Singleton
+  @Component(
+    modules = [
+      AccessibilityTestModule::class,
+      ActivityRecreatorTestModule::class,
+      ActivityRouterModule::class,
+      AlgebraicExpressionInputModule::class,
+      ApplicationLifecycleModule::class,
+      ApplicationModule::class,
+      ApplicationStartupListenerModule::class,
+      AssetModule::class,
+      CachingTestModule::class,
+      ContinueModule::class,
+      CpuPerformanceSnapshotterModule::class,
+      DeveloperOptionsModule::class,
+      DeveloperOptionsStarterModule::class,
+      DragDropSortInputModule::class,
+      ExpirationMetaDataRetrieverModule::class,
+      ExplorationProgressModule::class,
+      ExplorationStorageModule::class,
+      FakeOppiaClockModule::class,
+      FirebaseLogUploaderModule::class,
+      FractionInputModule::class,
+      GcsResourceModule::class,
+      GlideImageLoaderModule::class,
+      HintsAndSolutionConfigModule::class,
+      HintsAndSolutionProdModule::class,
+      HtmlParserEntityTypeModule::class,
+      ImageClickInputModule::class,
+      ImageParsingModule::class,
+      InteractionsModule::class,
+      ItemSelectionInputModule::class,
+      LocaleProdModule::class,
+      LogReportWorkerModule::class,
+      LogStorageModule::class,
+      LoggerModule::class,
+      LoggingIdentifierModule::class,
+      MathEquationInputModule::class,
+      MetricLogSchedulerModule::class,
+      MultipleChoiceInputModule::class,
+      NetworkConfigProdModule::class,
+      NetworkConnectionDebugUtilModule::class,
+      NetworkConnectionUtilDebugModule::class,
+      NumberWithUnitsRuleModule::class,
+      NumericExpressionInputModule::class,
+      NumericInputRuleModule::class,
+      PlatformParameterSingletonModule::class,
+      QuestionModule::class,
+      RatioInputModule::class,
+      RetrofitModule::class,
+      RetrofitServiceModule::class,
+      RobolectricModule::class,
+      SplitScreenInteractionModule::class,
+      SyncStatusModule::class,
+      TestAuthenticationModule::class,
+      TestDispatcherModule::class,
+      TestLogReportingModule::class,
+      TestPlatformParameterModule::class,
+      TestingBuildFlavorModule::class,
+      TextInputRuleModule::class,
+      ViewBindingShimModule::class,
+      WorkManagerConfigurationModule::class
+    ]
+  )
+  interface TestApplicationComponent : ApplicationComponent {
+    @Component.Builder
+    interface Builder : ApplicationComponent.Builder
+
+    fun inject(
+      numberWithUnitsInputInteractionViewTestActivityTest:
+        NumberWithUnitsInputInteractionViewTestActivityTest
+    )
+  }
+
+  class TestApplication : Application(), ActivityComponentFactory, ApplicationInjectorProvider {
+    private val component: TestApplicationComponent by lazy {
+      DaggerNumberWithUnitsInputInteractionViewTestActivityTest_TestApplicationComponent.builder()
+        .setApplication(this)
+        .build() as TestApplicationComponent
+    }
+
+    fun inject(
+      numberWithUnitsInputInteractionViewTestActivityTest:
+        NumberWithUnitsInputInteractionViewTestActivityTest
+    ) {
+      component.inject(numberWithUnitsInputInteractionViewTestActivityTest)
+    }
+
+    override fun createActivityComponent(activity: AppCompatActivity): ActivityComponent {
+      return component.getActivityComponentBuilderProvider().get().setActivity(activity).build()
+    }
+
+    override fun getApplicationInjector(): ApplicationInjector = component
+  }
+}
diff --git a/domain/BUILD.bazel b/domain/BUILD.bazel
index 974c4ce98cd..4fe8ab687ab 100755
--- a/domain/BUILD.bazel
+++ b/domain/BUILD.bazel
@@ -56,6 +56,7 @@ local_assets_library(
         "13",
         "test_exp_id_4",
         "test_exp_id_5",
+        "test_exp_id_6",
         "umPkwp0L1M0-",
         "MjZzEVOG47_1",
         "2mzzFVDLuAj8",
diff --git a/domain/src/main/assets/dev/test_story_id_2.json b/domain/src/main/assets/dev/test_story_id_2.json
index 4c40c1f1e94..b22df0620bc 100644
--- a/domain/src/main/assets/dev/test_story_id_2.json
+++ b/domain/src/main/assets/dev/test_story_id_2.json
@@ -11,6 +11,19 @@
     "outline": "",
     "title": "Fifth Exploration",
     "acquired_skill_ids": []
+  },
+  {
+    "description": "<unknown>",
+    "exploration_id": "test_exp_id_6",
+    "destination_node_ids": [],
+    "thumbnail_filename": "",
+    "outline_is_finalized": true,
+    "id": "test_exp_id_6",
+    "prerequisite_skill_ids": [],
+    "thumbnail_bg_color": "#d68f78",
+    "outline": "",
+    "title": "Number With Units Exploration",
+    "acquired_skill_ids": []
   }],
   "story_title": "Other Interesting Story",
   "story_description": "<removed>"
diff --git a/domain/src/main/assets/dev/test_story_id_2.textproto b/domain/src/main/assets/dev/test_story_id_2.textproto
index 7c8f773d4f9..bcf0b46dccb 100644
--- a/domain/src/main/assets/dev/test_story_id_2.textproto
+++ b/domain/src/main/assets/dev/test_story_id_2.textproto
@@ -25,6 +25,29 @@ chapters {
     content_id: "description"
   }
 }
+chapters {
+  exploration_id: "test_exp_id_6"
+  chapter_thumbnail {
+    background_color_rgb: 14061432
+  }
+  written_translations {
+    key: "title"
+    value {
+    }
+  }
+  written_translations {
+    key: "description"
+    value {
+    }
+  }
+  translatable_title {
+    html: "Number With Units Exploration"
+    content_id: "title"
+  }
+  translatable_description {
+    content_id: "description"
+  }
+}
 written_translations {
   key: "title"
   value {
diff --git a/domain/src/main/assets/test_exp_id_6.json b/domain/src/main/assets/test_exp_id_6.json
new file mode 100644
index 00000000000..e34aee01aab
--- /dev/null
+++ b/domain/src/main/assets/test_exp_id_6.json
@@ -0,0 +1,96 @@
+{
+  "exploration_id": "test_exp_id_6",
+  "preferred_audio_language_code": "<unknown>",
+  "correctness_feedback_enabled": false,
+  "version": 0,
+  "record_playthrough_probability": 0.0,
+  "exploration": {
+    "init_state_name": "NumberWithUnits",
+    "param_changes": [],
+    "param_specs": {},
+    "states": {
+      "End": {
+        "content": {
+          "content_id": "content",
+          "html": "<p>This is the end&nbsp;</p>"
+        },
+        "param_changes": [],
+        "interaction": {
+          "id": "EndExploration",
+          "customization_args": {
+            "recommendedExplorationIds": {
+              "value": []
+            }
+          },
+          "answer_groups": [],
+          "default_outcome": null,
+          "hints": [],
+          "solution": null
+        },
+        "classifier_model_id": "",
+        "recorded_voiceovers": {
+          "voiceovers_mapping": {
+            "content": {}
+          }
+        },
+        "written_translations": {
+          "translations_mapping": {
+            "content": {}
+          }
+        },
+        "solicit_answer_details": false,
+        "next_content_id_index": -1,
+        "linked_skill_id": null
+      },
+      "NumberWithUnits": {
+        "content": {
+          "content_id": "content",
+          "html": "<p>Convert 4.1 m to cm.</p>"
+        },
+        "interaction": {
+          "customization_args": {},
+          "hints": [],
+          "id": "NumberWithUnits",
+          "answer_groups": [{
+            "rule_specs": [{
+              "rule_type": "IsEqualTo",
+              "inputs": {
+                "f": {
+                  "fraction": {
+                    "denominator": 1,
+                    "isNegative": false,
+                    "numerator": 0,
+                    "wholeNumber": 0
+                  },
+                  "real": 410.0,
+                  "type": "real",
+                  "units": [{
+                    "exponent": 1,
+                    "unit": "cm"
+                  }]
+                }
+              }
+            }],
+            "outcome": {
+              "dest": "End",
+              "feedback": {
+                "content_id": "feedback_1",
+                "html": "<p>Yay.This is correct</p>"
+              },
+              "labelled_as_correct": true,
+              "param_changes": [],
+              "refresher_exploration_id": "",
+              "missing_prerequisite_skill_id": ""
+            },
+            "tagged_skill_misconception_id": ""
+          }],
+          "solution": []
+        }
+      }
+    },
+    "objective": "learn how to arrange the sentence",
+    "language_code": "en",
+    "correctness_feedback_enabled": false,
+    "title": "Drag and Drop Test Exploration"
+  }
+}
diff --git a/domain/src/main/assets/test_exp_id_6.textproto b/domain/src/main/assets/test_exp_id_6.textproto
new file mode 100644
index 00000000000..67ad2798193
--- /dev/null
+++ b/domain/src/main/assets/test_exp_id_6.textproto
@@ -0,0 +1,98 @@
+id: "test_exp_id_6"
+states {
+  key: "NumberWithUnits"
+  value {
+    name: "NumberWithUnits"
+    recorded_voiceovers {
+      key: "feedback_1"
+      value {
+      }
+    }
+    recorded_voiceovers {
+      key: "content"
+      value {
+      }
+    }
+    content {
+      html: "<p>Convert 4.1 m to cm.</p>"
+      content_id: "content"
+    }
+    written_translations {
+      key: "feedback_1"
+      value {
+      }
+    }
+    written_translations {
+      key: "content"
+      value {
+      }
+    }
+    interaction {
+      id: "Continue"
+      default_outcome {
+        dest_state_name: "End"
+        feedback {
+          html: "<p>Yay.This is correct</p>"
+          content_id: "feedback_1"
+        }
+        labelled_as_correct: true
+      }
+      customization_args {
+        key: "buttonText"
+        value {
+          normalized_string: "Continue"
+        }
+      }
+    }
+  }
+}
+states {
+  key: "End"
+  value {
+    name: "End"
+    recorded_voiceovers {
+      key: "content"
+      value {
+      }
+    }
+    content {
+      html: "<p>This is the end&nbsp;</p>"
+      content_id: "content"
+    }
+    written_translations {
+      key: "content"
+      value {
+      }
+    }
+    interaction {
+      id: "EndExploration"
+      customization_args {
+        key: "recommendedExplorationIds"
+        value {
+          schema_object_list {
+          }
+        }
+      }
+    }
+  }
+}
+init_state_name: "NumberWithUnits"
+language_code: "en"
+written_translations {
+  key: "title"
+  value {
+  }
+}
+written_translations {
+  key: "description"
+  value {
+  }
+}
+translatable_title {
+  html: "Drag and Drop Test Exploration"
+  content_id: "title"
+}
+description {
+  html: "learn how to arrange the sentence"
+  content_id: "description"
+}
diff --git a/domain/src/main/java/org/oppia/android/domain/topic/StoryProgressController.kt b/domain/src/main/java/org/oppia/android/domain/topic/StoryProgressController.kt
index b424deafecb..f9a9acce1f1 100644
--- a/domain/src/main/java/org/oppia/android/domain/topic/StoryProgressController.kt
+++ b/domain/src/main/java/org/oppia/android/domain/topic/StoryProgressController.kt
@@ -27,6 +27,7 @@ const val RATIOS_STORY_ID_1 = "xBSdg4oOClga"
 const val TEST_EXPLORATION_ID_2 = "test_exp_id_2"
 const val TEST_EXPLORATION_ID_4 = "test_exp_id_4"
 const val TEST_EXPLORATION_ID_5 = "test_exp_id_5"
+const val TEST_EXPLORATION_ID_6 = "test_exp_id_6"
 const val TEST_EXPLORATION_ID_13 = "13"
 const val FRACTIONS_EXPLORATION_ID_0 = "umPkwp0L1M0-"
 const val FRACTIONS_EXPLORATION_ID_1 = "MjZzEVOG47_1"
diff --git a/domain/src/main/java/org/oppia/android/domain/util/BUILD.bazel b/domain/src/main/java/org/oppia/android/domain/util/BUILD.bazel
index 2bbf388ce58..68a0c80971a 100644
--- a/domain/src/main/java/org/oppia/android/domain/util/BUILD.bazel
+++ b/domain/src/main/java/org/oppia/android/domain/util/BUILD.bazel
@@ -22,6 +22,7 @@ kt_android_library(
     srcs = [
         "InteractionObjectExtensions.kt",
         "JsonExtensions.kt",
+        "NumberWithUnitsExtensions.kt",
         "WorkDataExtensions.kt",
     ],
     visibility = ["//domain:__subpackages__"],
diff --git a/domain/src/main/java/org/oppia/android/domain/util/NumberWithUnitsExtensions.kt b/domain/src/main/java/org/oppia/android/domain/util/NumberWithUnitsExtensions.kt
new file mode 100644
index 00000000000..c45a69d00c3
--- /dev/null
+++ b/domain/src/main/java/org/oppia/android/domain/util/NumberWithUnitsExtensions.kt
@@ -0,0 +1,25 @@
+package org.oppia.android.domain.util
+
+import org.oppia.android.app.model.NumberUnit
+import org.oppia.android.app.model.NumberWithUnits
+
+/**
+ * Aggregates the units in a [NumberWithUnits] by summing the exponents of any duplicate units.
+ * This is useful for normalizing [NumberWithUnits] instances for comparison, since the order of
+ * units is irrelevant and duplicate units are effectively the same as a single unit with the
+ * exponent equal to the sum of the exponents of the duplicate units.
+ */
+fun NumberWithUnits.aggregate(): NumberWithUnits {
+  val aggregated = unitList.groupBy { it.unit }
+    .map { (unit, units) ->
+      NumberUnit.newBuilder()
+        .setUnit(unit)
+        .setExponent(units.sumOf { it.exponent })
+        .build()
+    }
+
+  return toBuilder()
+    .clearUnit()
+    .addAllUnit(aggregated)
+    .build()
+}
diff --git a/domain/src/main/java/org/oppia/android/domain/util/StateRetriever.kt b/domain/src/main/java/org/oppia/android/domain/util/StateRetriever.kt
index 5fe61ce3d5a..e2811591d06 100644
--- a/domain/src/main/java/org/oppia/android/domain/util/StateRetriever.kt
+++ b/domain/src/main/java/org/oppia/android/domain/util/StateRetriever.kt
@@ -424,6 +424,11 @@ class StateRetriever @Inject constructor() {
           mathExpression = inputJson.getStringFromObject("math_expression")
         }.build()
       }
+      "NumberWithUnits" -> {
+        InteractionObject.newBuilder().apply {
+          numberWithUnits = parseNumberWithUnitsObject(inputJson)
+        }.build()
+      }
       else -> error("Encountered unsupported interaction ID for solutions: $interactionId")
     }
   }
diff --git a/domain/src/test/java/org/oppia/android/domain/classify/rules/numberwithunits/NumberWithUnitsIsEqualToRuleClassifierProviderTest.kt b/domain/src/test/java/org/oppia/android/domain/classify/rules/numberwithunits/NumberWithUnitsIsEqualToRuleClassifierProviderTest.kt
index 7465f503070..7d4f99fa701 100644
--- a/domain/src/test/java/org/oppia/android/domain/classify/rules/numberwithunits/NumberWithUnitsIsEqualToRuleClassifierProviderTest.kt
+++ b/domain/src/test/java/org/oppia/android/domain/classify/rules/numberwithunits/NumberWithUnitsIsEqualToRuleClassifierProviderTest.kt
@@ -43,6 +43,10 @@ class NumberWithUnitsIsEqualToRuleClassifierProviderTest {
     InteractionObjectTestBuilder.createNumberUnit(unit = "p", exponent = 5)
   private val NUMBER_UNIT_TEST_STRING_TO_POWER_3 =
     InteractionObjectTestBuilder.createNumberUnit(unit = "e", exponent = 3)
+  private val NUMBER_UNIT_METER_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "meter", exponent = 1)
+  private val NUMBER_UNIT_METER_TO_POWER_2 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "meter", exponent = 2)
   private val ANSWER_TEST_NUMBER_WITH_UNITS =
     InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
       FRACTION_VALUE_TEST_2_OVER_5,
@@ -83,6 +87,94 @@ class NumberWithUnitsIsEqualToRuleClassifierProviderTest {
         NUMBER_UNIT_TEST_STRING_TO_POWER_3
       )
     )
+  private val TEST_AGGREGATED_FRACTION_ANSWER_NUMBER_WITH_UNITS =
+    InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+      FRACTION_VALUE_TEST_2_OVER_5,
+      listOf(NUMBER_UNIT_METER_TO_POWER_2)
+    )
+  private val TEST_DUPLICATED_FRACTION_INPUT_NUMBER_WITH_UNITS =
+    InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+      FRACTION_VALUE_TEST_2_OVER_5,
+      listOf(NUMBER_UNIT_METER_TO_POWER_1, NUMBER_UNIT_METER_TO_POWER_1)
+    )
+  private val FRACTION_VALUE_TEST_2 =
+    InteractionObjectTestBuilder.createFraction(
+      isNegative = false, numerator = 2, denominator = 1
+    ).fraction
+  private val FRACTION_VALUE_TEST_6_OVER_3 =
+    InteractionObjectTestBuilder.createFraction(
+      isNegative = false, numerator = 6, denominator = 3
+    ).fraction
+  private val FRACTION_VALUE_TEST_2_OVER_3 =
+    InteractionObjectTestBuilder.createFraction(
+      isNegative = false, numerator = 2, denominator = 3
+    ).fraction
+  private val FRACTION_VALUE_TEST_20_OVER_30 =
+    InteractionObjectTestBuilder.createFraction(
+      isNegative = false, numerator = 20, denominator = 30
+    ).fraction
+  private val FRACTION_VALUE_TEST_100 =
+    InteractionObjectTestBuilder.createFraction(
+      isNegative = false, numerator = 100, denominator = 1
+    ).fraction
+  private val FRACTION_VALUE_TEST_2000 =
+    InteractionObjectTestBuilder.createFraction(
+      isNegative = false, numerator = 2000, denominator = 1
+    ).fraction
+  private val FRACTION_VALUE_TEST_200 =
+    InteractionObjectTestBuilder.createFraction(
+      isNegative = false, numerator = 200, denominator = 1
+    ).fraction
+  private val FRACTION_VALUE_TEST_2_OVER_30 =
+    InteractionObjectTestBuilder.createFraction(
+      isNegative = false, numerator = 2, denominator = 30
+    ).fraction
+  private val FRACTION_VALUE_TEST_20 =
+    InteractionObjectTestBuilder.createFraction(
+      isNegative = false, numerator = 20, denominator = 1
+    ).fraction
+  private val FRACTION_VALUE_TEST_10 =
+    InteractionObjectTestBuilder.createFraction(
+      isNegative = false, numerator = 10, denominator = 1
+    ).fraction
+  private val UNIT_KG_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "kg", exponent = 1)
+  private val UNIT_G_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "g", exponent = 1)
+  private val UNIT_M_TO_POWER_NEGATIVE_2 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "m", exponent = -2)
+  private val UNIT_M_TO_POWER_2 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "m", exponent = 2)
+  private val UNIT_METER_TO_POWER_NEGATIVE_2 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "meter", exponent = -2)
+  private val UNIT_CM_TO_POWER_NEGATIVE_2 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "cm", exponent = -2)
+  private val UNIT_RUPEES_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "rupees", exponent = 1)
+  private val UNIT_RUPEE_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "rupee", exponent = 1)
+  private val UNIT_PAISE_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "paise", exponent = 1)
+  private val UNIT_DOLLARS_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "dollars", exponent = 1)
+  private val UNIT_DOLLAR_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "dollar", exponent = 1)
+  private val UNIT_DOLLARS_TITLE_CASE_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "Dollars", exponent = 1)
+  private val UNIT_CENTS_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "cents", exponent = 1)
+  private val UNIT_M_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "m", exponent = 1)
+  private val UNIT_S_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "s", exponent = 1)
+  private val UNIT_S_TO_POWER_2 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "s", exponent = 2)
+  private val UNIT_S_TO_POWER_NEGATIVE_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "s", exponent = -1)
+  private val UNIT_N_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "N", exponent = 1)
+  private val UNIT_J_TO_POWER_1 =
+    InteractionObjectTestBuilder.createNumberUnit(unit = "J", exponent = 1)
 
   @Inject
   internal lateinit var numberWithUnitsIsEqualToRuleClassifierProvider:
@@ -181,6 +273,565 @@ class NumberWithUnitsIsEqualToRuleClassifierProviderTest {
     assertThat(matches).isTrue()
   }
 
+  @Test
+  fun testFractionInputWithDuplicateUnits_withEquivalentAggregatedFractionAnswer_doesNotMatch() {
+    val inputs = mapOf("f" to TEST_DUPLICATED_FRACTION_INPUT_NUMBER_WITH_UNITS)
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = TEST_AGGREGATED_FRACTION_ANSWER_NUMBER_WITH_UNITS,
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testFractionInputNumberWithUnits_withEquivalentRealAnswer_doesNotMatch() {
+    val inputs = mapOf("f" to INPUT_TEST_NUMBER_WITH_UNITS)
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForReal(
+          number = 0.4,
+          units = listOf(NUMBER_UNIT_TEST_STRING_TO_POWER_3, NUMBER_UNIT_TEST_STRING_TO_POWER_5)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testExactValueMatch_fractionKgMNegative2_matches() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_2,
+        listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_2,
+          listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testExactValueMatch_negativeRealM2_matches() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForReal(
+        number = -4.5,
+        units = listOf(UNIT_M_TO_POWER_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForReal(
+          number = -4.5,
+          units = listOf(UNIT_M_TO_POWER_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testExactValueMatch_fractionTwoThirdsKgMNegative2_matches() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_2_OVER_3,
+        listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_2_OVER_3,
+          listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testExactValueMatch_hundredRupees_matches() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_100,
+        listOf(UNIT_RUPEES_TO_POWER_1)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_100,
+          listOf(UNIT_RUPEES_TO_POWER_1)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testExactValueMatch_hundredDollars_matches() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_100,
+        listOf(UNIT_DOLLARS_TO_POWER_1)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_100,
+          listOf(UNIT_DOLLARS_TO_POWER_1)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testExactValueMatch_hundredCents_matches() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_100,
+        listOf(UNIT_CENTS_TO_POWER_1)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_100,
+          listOf(UNIT_CENTS_TO_POWER_1)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testApproximateValueMatch_fractionSixOverThree_vsTwo_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_6_OVER_3,
+        listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_2,
+          listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testApproximateValueMatch_fractionTwentyOverThirty_vsTwoThirds_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_20_OVER_30,
+        listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_2_OVER_3,
+          listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testApproximateValueMatch_realVsFractionEquivalent_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForReal(
+        number = 0.666666666666,
+        units = listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_2_OVER_3,
+          listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testApproximateValueMatch_realPoint66VsFractionTwoThirds_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForReal(
+        number = 0.66,
+        units = listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_2_OVER_3,
+          listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testValueMismatch_realTwoPointFiveVsTwo_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForReal(
+        number = 2.5,
+        units = listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForReal(
+          number = 2.0,
+          units = listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testExponentMismatch_kgM2VsKgMNegative2_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_2,
+        listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_2,
+          listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testUnitMismatch_kgM2VsKgMNegative2_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_2,
+        listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_2,
+          listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testUnitMismatch_hundredRupeesVsHundredPaise_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_100,
+        listOf(UNIT_RUPEES_TO_POWER_1)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_100,
+          listOf(UNIT_PAISE_TO_POWER_1)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testUnitMismatch_hundredDollarsVsHundredCents_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_100,
+        listOf(UNIT_DOLLARS_TO_POWER_1)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_100,
+          listOf(UNIT_CENTS_TO_POWER_1)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testUnitMismatch_hundredRupeesVsHundredDollars_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_100,
+        listOf(UNIT_RUPEES_TO_POWER_1)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_100,
+          listOf(UNIT_DOLLARS_TO_POWER_1)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testUnitConversion_twoThousandGmNegative2VsTwoKgMNegative2_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_2000,
+        listOf(UNIT_G_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_2,
+          listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testUnitConversion_realPoint2GcmNegative2VsTwoKgMNegative2_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForReal(
+        number = 0.2,
+        units = listOf(UNIT_G_TO_POWER_1, UNIT_CM_TO_POWER_NEGATIVE_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_2,
+          listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testUnitConversion_fractionTwoOverThirtyGcmNegative2VsTwoThirdsKgMNegative2_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_2_OVER_30,
+        listOf(UNIT_G_TO_POWER_1, UNIT_CM_TO_POWER_NEGATIVE_2)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_2_OVER_3,
+          listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_NEGATIVE_2)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testUnitConversion_twoRupeesVsTwoHundredPaise_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_2,
+        listOf(UNIT_RUPEES_TO_POWER_1)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_200,
+          listOf(UNIT_PAISE_TO_POWER_1)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testUnitConversion_twoDollarsVsTwoHundredCents_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_2,
+        listOf(UNIT_DOLLARS_TO_POWER_1)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_200,
+          listOf(UNIT_CENTS_TO_POWER_1)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testUnitReduction_twentyMSquareSecondPerSecondVsTwentyMPerSecond_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_20,
+        listOf(UNIT_M_TO_POWER_1, UNIT_S_TO_POWER_2, UNIT_S_TO_POWER_NEGATIVE_1)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_20,
+          listOf(UNIT_M_TO_POWER_1, UNIT_S_TO_POWER_1)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testUnitCombination_tenNewtonMeterVsTenJoule_doesNotMatch() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_10,
+        listOf(UNIT_N_TO_POWER_1, UNIT_M_TO_POWER_1)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_10,
+          listOf(UNIT_J_TO_POWER_1)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isFalse()
+  }
+
+  @Test
+  fun testUnitReordering_twoMKgPerSecondVsTwoKgMPerSecond_matches() {
+    val inputs = mapOf(
+      "f" to InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+        FRACTION_VALUE_TEST_2,
+        listOf(UNIT_M_TO_POWER_1, UNIT_KG_TO_POWER_1, UNIT_S_TO_POWER_NEGATIVE_1)
+      )
+    )
+
+    val matches =
+      unitsIsEqualsRuleClassifier.matches(
+        answer = InteractionObjectTestBuilder.createNumberWithUnitsForFraction(
+          FRACTION_VALUE_TEST_2,
+          listOf(UNIT_KG_TO_POWER_1, UNIT_M_TO_POWER_1, UNIT_S_TO_POWER_NEGATIVE_1)
+        ),
+        inputs = inputs,
+        classificationContext = ClassificationContext()
+      )
+
+    assertThat(matches).isTrue()
+  }
+
   @Test
   fun testWholeNumberInputValue_withRealAnswerNumWithUnits_throwsException() {
     val inputs = mapOf("f" to WHOLE_NUMBER_VALUE_9)
diff --git a/domain/src/test/java/org/oppia/android/domain/topic/TopicListControllerTest.kt b/domain/src/test/java/org/oppia/android/domain/topic/TopicListControllerTest.kt
index 0939342f851..6c0a1d060d7 100644
--- a/domain/src/test/java/org/oppia/android/domain/topic/TopicListControllerTest.kt
+++ b/domain/src/test/java/org/oppia/android/domain/topic/TopicListControllerTest.kt
@@ -153,7 +153,7 @@ class TopicListControllerTest {
     val topicList = retrieveTopicList()
 
     val secondTopic = topicList.getTopicSummary(1).topicSummary
-    assertThat(secondTopic.totalChapterCount).isEqualTo(1)
+    assertThat(secondTopic.totalChapterCount).isEqualTo(2)
   }
 
   @Test
@@ -749,7 +749,7 @@ class TopicListControllerTest {
     assertThat(promotedStory.nextChapterTitle.html).isEqualTo("Fifth Exploration")
     assertThat(promotedStory.completedChapterCount).isEqualTo(0)
     assertThat(promotedStory.isTopicLearned).isFalse()
-    assertThat(promotedStory.totalChapterCount).isEqualTo(1)
+    assertThat(promotedStory.totalChapterCount).isEqualTo(2)
   }
 
   private fun verifyOngoingStoryAsFractionStory0Exploration0(promotedStory: PromotedStory) {
diff --git a/scripts/assets/accessibility_label_exemptions.textproto b/scripts/assets/accessibility_label_exemptions.textproto
index 63788bad5cd..aa8e4e488b9 100644
--- a/scripts/assets/accessibility_label_exemptions.textproto
+++ b/scripts/assets/accessibility_label_exemptions.textproto
@@ -30,6 +30,7 @@ exempted_activity: "app/src/main/java/org/oppia/android/app/testing/LessonThumbn
 exempted_activity: "app/src/main/java/org/oppia/android/app/testing/MarginBindingAdaptersTestActivity"
 exempted_activity: "app/src/main/java/org/oppia/android/app/testing/MathExpressionInteractionsViewTestActivity"
 exempted_activity: "app/src/main/java/org/oppia/android/app/testing/NavigationDrawerTestActivity"
+exempted_activity: "app/src/main/java/org/oppia/android/app/testing/NumberWithUnitsInputInteractionViewTestActivity"
 exempted_activity: "app/src/main/java/org/oppia/android/app/testing/PoliciesFragmentTestActivity"
 exempted_activity: "app/src/main/java/org/oppia/android/app/testing/ProfileChooserFragmentTestActivity"
 exempted_activity: "app/src/main/java/org/oppia/android/app/testing/StateAssemblerMarginBindingAdaptersTestActivity"
diff --git a/scripts/assets/test_file_exemptions.textproto b/scripts/assets/test_file_exemptions.textproto
index 79faa5ab53a..4aa052890c2 100644
--- a/scripts/assets/test_file_exemptions.textproto
+++ b/scripts/assets/test_file_exemptions.textproto
@@ -378,6 +378,10 @@ test_file_exemption {
   exempted_file_path: "app/src/main/java/org/oppia/android/app/customview/interaction/MathExpressionInteractionsView.kt"
   source_file_is_incompatible_with_code_coverage: true
 }
+test_file_exemption {
+  exempted_file_path: "app/src/main/java/org/oppia/android/app/customview/interaction/NumberWithUnitsInputInteractionView.kt"
+  test_file_not_required: true
+}
 test_file_exemption {
   exempted_file_path: "app/src/main/java/org/oppia/android/app/customview/interaction/NumericInputInteractionView.kt"
   test_file_not_required: true
@@ -1832,6 +1836,10 @@ test_file_exemption {
   exempted_file_path: "app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/NextButtonViewModel.kt"
   test_file_not_required: true
 }
+test_file_exemption {
+  exempted_file_path: "app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/NumberWithUnitsInputViewModel.kt"
+  test_file_not_required: true
+}
 test_file_exemption {
   exempted_file_path: "app/src/main/java/org/oppia/android/app/player/state/itemviewmodel/NumericInputViewModel.kt"
   test_file_not_required: true
@@ -4151,6 +4159,10 @@ test_file_exemption {
   exempted_file_path: "domain/src/main/java/org/oppia/android/domain/util/JsonExtensions.kt"
   test_file_not_required: true
 }
+test_file_exemption {
+  exempted_file_path: "domain/src/main/java/org/oppia/android/domain/util/NumberWithUnitsExtensions.kt"
+  test_file_not_required: true
+}
 test_file_exemption {
   exempted_file_path: "domain/src/main/java/org/oppia/android/domain/util/StateRetriever.kt"
   source_file_is_incompatible_with_code_coverage: true
diff --git a/testing/src/main/java/org/oppia/android/testing/story/StoryProgressTestHelper.kt b/testing/src/main/java/org/oppia/android/testing/story/StoryProgressTestHelper.kt
index 98ef108d16f..fa60c74d821 100644
--- a/testing/src/main/java/org/oppia/android/testing/story/StoryProgressTestHelper.kt
+++ b/testing/src/main/java/org/oppia/android/testing/story/StoryProgressTestHelper.kt
@@ -27,6 +27,7 @@ import org.oppia.android.domain.topic.TEST_EXPLORATION_ID_13
 import org.oppia.android.domain.topic.TEST_EXPLORATION_ID_2
 import org.oppia.android.domain.topic.TEST_EXPLORATION_ID_4
 import org.oppia.android.domain.topic.TEST_EXPLORATION_ID_5
+import org.oppia.android.domain.topic.TEST_EXPLORATION_ID_6
 import org.oppia.android.domain.topic.TEST_STORY_ID_0
 import org.oppia.android.domain.topic.TEST_STORY_ID_2
 import org.oppia.android.domain.topic.TEST_TOPIC_ID_0
@@ -130,7 +131,7 @@ class StoryProgressTestHelper @Inject constructor(
   }
 
   /**
-   * Marks the only chapter of test topic 1 story 2 as completed, and any needed prerequisites.
+   * Marks the first chapter of test topic 1 story 2 as completed, and any needed prerequisites.
    * See [markCompletedTestTopic0Story0Exp0] for specifics on the parameters passed to this method,
    * and any other nuances.
    */
@@ -147,6 +148,26 @@ class StoryProgressTestHelper @Inject constructor(
     )
   }
 
+  /**
+   * Marks the second chapter of test topic 1 story 2 as completed, and any needed prerequisites.
+   * See [markCompletedTestTopic0Story0Exp0] for specifics on the parameters passed to this method,
+   * and any other nuances.
+   */
+  fun markCompletedTestTopic1Story0Exp1(
+    profileId: LegacyProfileId,
+    timestampOlderThanOneWeek: Boolean
+  ) {
+    // Must complete prerequisite chapter first.
+    markCompletedTestTopic1Story0Exp0(profileId, timestampOlderThanOneWeek)
+    recordCompletedChapter(
+      profileId,
+      TEST_TOPIC_ID_1,
+      TEST_STORY_ID_2,
+      TEST_EXPLORATION_ID_6,
+      timestampOlderThanOneWeek
+    )
+  }
+
   /**
    * Marks test topic 0's story 0 as completed. See [markCompletedTestTopic0Story0Exp0] for
    * specifics on the parameters passed to this method, and any other nuances.
@@ -167,7 +188,8 @@ class StoryProgressTestHelper @Inject constructor(
     profileId: LegacyProfileId,
     timestampOlderThanOneWeek: Boolean
   ) {
-    markCompletedTestTopic1Story0Exp0(profileId, timestampOlderThanOneWeek)
+    // Complete last chapter (+ previous automatically).
+    markCompletedTestTopic1Story0Exp1(profileId, timestampOlderThanOneWeek)
   }
 
   /**
@@ -485,7 +507,7 @@ class StoryProgressTestHelper @Inject constructor(
   }
 
   /**
-   * Marks the only chapter of test topic 1 story 2 as in progress saved. For specifics on parameters
+   * Marks the first chapter of test topic 1 story 2 as in progress saved. For specifics on parameters
    * and nuances, see: [markInProgressSavedTestTopic0Story0Exp0].
    */
   fun markInProgressSavedTestTopic1Story2Exp0(
@@ -502,7 +524,7 @@ class StoryProgressTestHelper @Inject constructor(
   }
 
   /**
-   * Marks the only chapter of test topic 1 story 2 as in progress not saved. For specifics on parameters
+   * Marks the first chapter of test topic 1 story 2 as in progress not saved. For specifics on parameters
    * and nuances, see: [markInProgressNotSavedTestTopic0Story0Exp0].
    */
   fun markInProgressNotSavedTestTopic1Story2Exp0(
@@ -518,6 +540,44 @@ class StoryProgressTestHelper @Inject constructor(
     )
   }
 
+  /**
+   * Marks the second chapter of test topic 1 story 2 as in progress saved. For specifics on parameters
+   * and nuances, see: [markInProgressSavedTestTopic0Story0Exp0].
+   */
+  fun markInProgressSavedTestTopic1Story2Exp1(
+    profileId: LegacyProfileId,
+    timestampOlderThanOneWeek: Boolean
+  ) {
+    // Must complete the previous chapter first.
+    markCompletedTestTopic1Story0Exp0(profileId, timestampOlderThanOneWeek)
+    recordChapterAsInProgressSaved(
+      profileId,
+      TEST_TOPIC_ID_1,
+      TEST_STORY_ID_2,
+      TEST_EXPLORATION_ID_6,
+      timestampOlderThanOneWeek
+    )
+  }
+
+  /**
+   * Marks the second chapter of test topic 1 story 2 as in progress not saved. For specifics on parameters
+   * and nuances, see: [markInProgressNotSavedTestTopic0Story0Exp0].
+   */
+  fun markInProgressNotSavedTestTopic1Story2Exp1(
+    profileId: LegacyProfileId,
+    timestampOlderThanOneWeek: Boolean
+  ) {
+    // Must complete the previous chapter first.
+    markCompletedTestTopic1Story0Exp0(profileId, timestampOlderThanOneWeek)
+    recordChapterAsInProgressNotSaved(
+      profileId,
+      TEST_TOPIC_ID_1,
+      TEST_STORY_ID_2,
+      TEST_EXPLORATION_ID_6,
+      timestampOlderThanOneWeek
+    )
+  }
+
   /**
    * Marks test topic 0's story 0 as in progress saved. For specifics on parameters and nuances, see:
    * [markInProgressSavedTestTopic0Story0Exp0].