Khan/khan-exercises — Issue #11525: Number properties terminology 1 - frustrated
Author: KhanBugz
Created: 2012-01-18 16:42:46+00:00
State: open
Labels: hard, safari, snowleo

the problems are too difficult for many 6th graders

[number_properties_terminology_1.html?seed=28&problem=commutative-variable](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/number_properties_terminology_1.html?seed=28&problem=commutative-variable&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/number_properties_terminology_1.html?seed=28&problem=commutative-variable&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%20%5C%5C%5C%22%3Ea%2B(b%2Bc\)%3D(a%2Bb\)%2Bc%3C%2Fcode%3E%5C%22%22%2C59%5D%2C%5B%22incorrect-activity%22%2C%22%5C%22%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%20%5C%5C%5C%22%3Ea%2B(b%2Bc\)%3D(a%2Bb\)%2Bc%3C%2Fcode%3E%5C%22%22%2C2%5D%2C%5B%22correct-activity%22%2C%22%5C%22%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%20%5C%5C%5C%22%3Ea%2Bb%3Db%2Ba%3C%2Fcode%3E%5C%22%22%2C2%5D%5D)

["a+(b+c)=(a+b)+c","a+(b+c)=(a+b)+c","a+b=b+a"]

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50

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