Khan/khan-exercises — Issue #4737: Addition 1 - 20
Author: KhanBugz
Created: 2011-10-21 19:57:01+00:00
State: open
Labels: ie8, ie9, win7

[addition_1.html?seed=39&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/addition_1.html?seed=39&problem=0&debug)

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Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; AskTB5.6)

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