Rational Numbers: 7th grade math

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A video lesson on rational numbers: what are they, what aren't they, how do you add, subtract multiply and divide them
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It is a little lame. But I get bored doing all these videos and sometimes try to play with them a bit.

StanLisleMasterMath
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Not sure if that was more cute or creepy!

anyacarlson
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I didn't understand it at all. How would 12 go into 24/2? That just doesn't make any sense to me. :(

lakencastro