Khan/khan-exercises — Issue #15282: Addition 4 - no writeing
Author: KhanBugz
Created: 2012-03-03 03:38:28+00:00
State: open
Labels: firefox, other, win7

[addition_4.html?seed=146&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/addition_4.html?seed=146&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/addition_4.html?seed=146&problem=0&debug&activity=%5B%5D)

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Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1

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