diff --git a/assessment/macros/randomizers.php b/assessment/macros/randomizers.php
index c78391f53..4cfac0564 100644
--- a/assessment/macros/randomizers.php
+++ b/assessment/macros/randomizers.php
@@ -9,7 +9,9 @@
     'rands',
     'rrands',
     'randfrom',
+    'randkeyfrom',
     'randsfrom',
+    'randkeysfrom',
     'jointrandfrom',
     'diffrandsfrom',
     'nonzerorand',
@@ -138,6 +140,23 @@ function randfrom($lst) {
 }
 
 
+function randkeyfrom($lst) {
+    if (func_num_args() != 1) {
+        echo "randkeyfrom expects 1 argument";
+        return 1;
+    }
+    if (!is_array($lst)) {
+        echo "randkeyfrom expects an array";
+        return 1;
+    }
+    if (count($lst) == 0) {
+        echo 'cannot pick randkeyfrom empty array';
+        return '';
+    }
+    return $GLOBALS['RND']->array_rand($lst, 1);
+}
+
+
 function randsfrom($lst, $n, $ord = 'def') {
     if (func_num_args() < 2) {
         echo "randsfrom expects 2 arguments";
@@ -163,6 +182,27 @@ function randsfrom($lst, $n, $ord = 'def') {
 }
 
 
+function randkeysfrom($lst, $n = 1) {
+    if (func_num_args() < 1) {
+        echo "randkeysfrom expects at least 1 argument";
+        return 1;
+    }
+    if (!is_array($lst)) {
+        echo "randkeysfrom expects an array";
+        return 1;
+    }
+    $n = floor($n);
+    if ($n <= 0) {
+        echo "randkeysfrom: need n &gt; 0";
+    }
+    if (count($lst) == 0) {
+        echo 'cannot pick randkeysfrom empty array';
+        return '';
+    }
+    return $GLOBALS['RND']->array_rand($lst, $n);
+}
+
+
 function jointrandfrom() {
     $args = func_get_args();
     if (count($args) < 2) {
diff --git a/help.html b/help.html
index 08e1791ba..45ba8aa7c 100644
--- a/help.html
+++ b/help.html
@@ -2332,6 +2332,8 @@ <h2 id="randomizers">Randomizers</h2>
 
 $arr = [10,20,30]
 $val = randfrom($arr)                // might return 20</pre></details></li>
+<li><strong>randkeyfrom(array)</strong>: Return a random key from the array.
+  <details class="example"><summary>Example</summary><pre>$x = randkeyfrom(["a"=>"A", "b"=>"B", "c"=>"C"])  // e.g. $x="b"</pre></details></li>
 <li><strong>randname(),randmalename(),randfemalename()</strong>:  Returns a random first name
   <details class="example"><summary>Example</summary><pre>$name = randname()       // might return "Sofia"
 $name = randmalename()   // might return "Carlos"
@@ -2369,6 +2371,9 @@ <h2 id="randomizers">Randomizers</h2>
   <details class="example"><summary>Example</summary><pre>$a,$b = randsfrom("red,green,blue,yellow", 2)  // e.g. "blue", "red"
 $arr = [2,4,6,8]
 $a,$b = randsfrom($arr, 2, 'inc');         // sorted ascending, e.g. 2, 6</pre></details></li>
+<li><strong>randkeysfrom(array,n)</strong>: Return n random keys from the array.
+  <details class="example"><summary>Example</summary><pre>$arr = [0=>'x_0', 1=>'x_1', 2=>'x_2', 3=>'x_3']
+$a,$b = randkeysfrom($arr, 2);  // e.g., $a=2, $b=0</pre></details></li>
 <li><strong>jointrandfrom(list/array,list/array,[list/array,...])</strong>:  Returns one element from each list, where the location used in each list is the same
   <details class="example"><summary>Example</summary><pre>$first,$last = jointrandfrom("Alice,Bob,Carlos", "Smith,Jones,Rivera")
 // picks the same index from each list, so names stay paired: