Khan/khan-exercises — Issue #11672: Adding and subtracting fractions - adding and subtracting fractions
Author: KhanBugz
Created: 2012-01-20 02:50:01+00:00
State: open
Labels: chrome, wrong-or-unclear, xp

you don't add the numerator while subtracting fractions

[adding_and_subtracting_fractions.html?seed=34&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/adding_and_subtracting_fractions.html?seed=34&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/adding_and_subtracting_fractions.html?seed=34&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%227%2F12%5C%22%22%2C90%5D%2C%5B%22incorrect-activity%22%2C%22%5C%22-7%2F12%5C%22%22%2C9%5D%2C%5B%22hint-activity%22%2C%220%22%2C2%5D%2C%5B%22hint-activity%22%2C%220%22%2C3%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%2C%5B%22hint-activity%22%2C%220%22%2C5%5D%2C%5B%22hint-activity%22%2C%220%22%2C5%5D%2C%5B%22hint-activity%22%2C%220%22%2C6%5D%5D)

["7/12","-7/12"]

Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7

MathJax is loaded, ready, queue length: 0