Subtraction in ten minutes

LeftoverPi shows how to do multi-digit subtraction using addition.


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Posted
03 Sep 2007 by jibbajabba
1 comment

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01 Alexa
01/17/08 @ 22:59

Is this new new math that they're teaching in schools? I'm just curious. It's cool and makes sense and I would have loved to have learned it two decades ago when I was in elementary school.

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