Khan/khan-exercises — Issue #12522: Adding and subtracting fractions - I don 't understand
Author: KhanBugz
Created: 2012-01-31 03:30:40+00:00
State: open
Labels: hard, ie8, ie9, win7

I don't understand how to donegitive fractions

[adding_and_subtracting_fractions.html?seed=137&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/adding_and_subtracting_fractions.html?seed=137&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/adding_and_subtracting_fractions.html?seed=137&problem=0&debug&activity=%5B%5D)

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