Khan/khan-exercises — Issue #4043: Adding and subtracting fractions - adding and subtracting fractions
Author: KhanBugz
Created: 2011-10-09 04:08:09+00:00
State: open
Labels: firefox, xp

-8/7 - 2/4 = -46/28 - marked wrong = simplify; 4/9 + 5/2 = 53/18 when I simplified to 2 14/18 or 2 7/9 both were wrong and 53/18 was right- no simplify. ???!

[adding_and_subtracting_fractions.html?seed=149&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/adding_and_subtracting_fractions.html?seed=149&problem=0)

["-46/28"]

Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1

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