Khan/khan-exercises — Issue #8617: Subtraction 1 - Subtraction 1
Author: KhanBugz
Created: 2011-12-14 07:16:53+00:00
State: open
Labels: ie8, ie9, not-showing, win7

The problems do not always appear, in fact, more often than not, I have to refresh the page to get a problem to show up.

[subtraction_1.html?seed=144&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/subtraction_1.html?seed=144&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/subtraction_1.html?seed=144&problem=0&debug&activity=%5B%5D)

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