diff --git a/mod/quiz/questiontypes/numerical/numerical.html b/mod/quiz/questiontypes/numerical/numerical.html
index bfa905a8144..bba0ca116f8 100644
--- a/mod/quiz/questiontypes/numerical/numerical.html
+++ b/mod/quiz/questiontypes/numerical/numerical.html
@@ -81,7 +81,7 @@
 <tr valign="top">
     <td align="right"><b><?php  print_string("acceptederror", "quiz"); ?>:</b></td>
     <td>
-        <input align="left" type="text" id="acceptederror0" name="tolerance" size="10" value="<?php p($tolerance); ?>" alt="<?php  print_string("acceptederror", "quiz"); ?>" />&plusmn;
+        <input align="left" type="text" id="acceptederror0" name="tolerance[]" size="10" value="<?php p($tolerance); ?>" alt="<?php  print_string("acceptederror", "quiz"); ?>" />&plusmn;
         <input type="hidden" name="fraction[]" value="1" />
     </td>
 </tr>
diff --git a/mod/quiz/questiontypes/numerical/questiontype.php b/mod/quiz/questiontypes/numerical/questiontype.php
index f7de6803f4b..a5595439d9c 100644
--- a/mod/quiz/questiontypes/numerical/questiontype.php
+++ b/mod/quiz/questiontypes/numerical/questiontype.php
@@ -51,7 +51,6 @@ class quiz_numerical_qtype extends quiz_shortanswer_qtype {
                 }
             }
         }
-
         return true;
     }
 
@@ -133,7 +132,7 @@ class quiz_numerical_qtype extends quiz_shortanswer_qtype {
                 }
                 $options->question  = $question->id;
                 $options->answer    = $answer->id;
-                $options->tolerance = $this->apply_unit($question->tolerance, $units);
+                $options->tolerance = $this->apply_unit($question->tolerance[$key], $units);
 
                 // Save options
                 if (isset($options->id)) { // reusing existing record