Fixes small number rounding issue formula questions

fixes CNVS-22981

test plan:
- Create a Formula question which uses 1 decimal place
- Use a set of numbers which would generate a two decimal
  answer ending in a 5
- Ensure that number rounds as expected

Change-Id: Id8bcd017795b85b60636bcc0d202b55ad74b3bdf
Reviewed-on: https://gerrit.instructure.com/63706
Tested-by: Jenkins
Reviewed-by: Brian Finney <bfinney@instructure.com>
QA-Review: Deepeeca Soundarrajan <dsoundarrajan@instructure.com>
Product-Review: Jason Sparks <jsparks@instructure.com>

Author: Davis McClellan

public/javascripts/calcCmd.js

@@ -205,7 +205,7 @@ define([
         } else if(item.token == 'divide') {
           var left = round2.pop();
           var right = round1[idx + 1];
-          round2.push(numberItem(compute(left) / compute(right)));
+            round2.push(numberItem(+(compute(left) / compute(right)).toFixed(12)));
         } else {
           round2.push(round1[idx]);
           round2.push(round1[idx + 1]);