diff --git a/question/type/numerical/lang/en/qtype_numerical.php b/question/type/numerical/lang/en/qtype_numerical.php
index 6acd2ae362b..769b80b8849 100644
--- a/question/type/numerical/lang/en/qtype_numerical.php
+++ b/question/type/numerical/lang/en/qtype_numerical.php
@@ -53,6 +53,11 @@ then any number between 25 and 35 will be accepted as correct.
 Like with short answer questions, different answers, or the same
 answer with different precisions can be given.'; 
 $string['numericalsummary'] = 'Allows a numerical response, possibly with units, that is graded by comparing against various model answers, possibly with tolerances.';
+$string['numericalmultiplier'] = 'Multiplier'; 
+$string['numericalmultiplier_help'] = 'The Correct numerical response will be multiplied by the multiplier related to a specific unit to obtain the Correct response in this unit.<br/>
+ <p> The first unit (Unit1) has a default multiplier of 1. </p>
+ <p> So, if your Correct numerical response is 5500 and you set W as unit at Unit1 which has 1 as default multiplier, the Correct response is 5500 W.</p> 
+ <p> If you add the unit kW with a multiplier of 0.001, this will add a Correct response of 5 kW. </p><p>This means that the answers 5500, 5500W or 5.5kW would all be marked correct.</p><p> Note that the accepted error is also multiplied, so an allowed error of 100W would become an error of 0.1kW.</p>'; 
 $string['onlynumerical'] = 'Only NUMERICAL ANSWER will be graded' ;
 $string['rightexample'] = 'RIGHT as 1.00cm' ;
 $string['selectunits'] = 'Select units' ; 
diff --git a/question/type/numerical/questiontype.php b/question/type/numerical/questiontype.php
index 8e22867f5d9..30309292ea8 100644
--- a/question/type/numerical/questiontype.php
+++ b/question/type/numerical/questiontype.php
@@ -777,6 +777,7 @@ class question_numerical_qtype extends question_shortanswer_qtype {
             $firstunit->freeze();
             $firstunit->setValue('1.0');
             $firstunit->setPersistantFreeze(true);
+            $mform->setHelpButton('multiplier[0]', array('numericalmultiplier', get_string('numericalmultiplier', 'qtype_numerical'), 'qtype_numerical'));            
         }
     }
 /**