Perl Variables for Math Questions (Algebraic and Symbolic Modes)
The following reserved Perl variables are used to return information or set behaviors in questions that you create in WebAssign.
Variable 
Description 

$CASGRADER 
(Algebraic) Sets the grading mechanism, for example,

$DEFAULTVALS 
(Symbolic) Sets the list of values that will be used when comparing student responses
to the answer key, for example, 
$MAXERR=n $MAXERR='n%' 
(Symbolic) Set $MAXERR to the allowable tolerance (>0) for evaluated student responses. 
$NO_REPETITION 
(Symbolic) Set 
$NO_SYMBOLIC_HINT 
(Symbolic) Set 
$ROSTER_ONLY 
(Symbolic) Set 
$PAD 
Enables one of two pads for answering math questions (and hides symbolic formatting help icon):

$size 
Sets the width of the answer box when not using mathPad or calcPad, for example,
