Khan/khan-exercises — Issue #12630: Number properties terminology 1 - The page has a problem
Author: KhanBugz
Created: 2012-01-31 23:11:50+00:00
State: open
Labels: chrome, other

The question is:
*****
Which one of the following equations represents the Commutative Property of addition:

a+b=b+a

value;
*****

But I can't put any answer, the answer textbox has disappeared.

[number_properties_terminology_1.html?seed=117&problem=commutative-variable](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/number_properties_terminology_1.html?seed=117&problem=commutative-variable&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/number_properties_terminology_1.html?seed=117&problem=commutative-variable&debug&activity=undefined)

undefined

Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.77 Safari/535.7

MathJax is loaded, ready, queue length: 0