Khan/khan-exercises — Issue #5253: Properties of numbers 1 - No number
Author: KhanBugz
Created: 2011-10-31 07:58:08+00:00
State: open
Labels: firefox, snowleo

What number could replace below?
there is no number

[properties_of_numbers_1.html?seed=81&problem=commutative-show-left](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/properties_of_numbers_1.html?seed=81&problem=commutative-show-left&debug)

["0"]

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:7.0.1) Gecko/20100101 Firefox/7.0.1

MathJax is loaded, ready, queue length: 0