math
posted by yc .
subtract with or without regrouping...which number can you subtract from 17 w/ or w/out needing to regropu?For which numbers would you need to regroup?

math 
Ms. Sue
You would need to regroup if you subtract 8 or 9 from 17.
http://www.mathsisfun.com/numbers/subtractionregrouping.html
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