Short-cut Subtraction for Problems with Zeroes

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Short-cut Subtraction for Problems with Zeroes

BLOG Post 08/23/12 – Short-Cut Subtraction with Zeros

Don’t you just hate trying to subtract 99 from a number like 4000? And teaching it is even more difficult. You find you have to regroup several times.  Here is an easy way that I never knew about growing up.  Say you have a problem like the ones below.  Here’s the secret. If you rewrite the problem…

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