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Montgomery County Public Schools (MCPS)
Reply to "More WTH 3rd Grade Math, Round Two."
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[quote=Anonymous][quote=Anonymous]PP at 21:00 -- adding on that this assumes that the child understands that 30 is 3 tens, and that 31 is 3 tens plus 1 one; i.e., concepts about place value and regrouping/composition/decomposition.[/quote] From the mouth of the chief author of the common core standard: William McCallum "I also don't understand why the author believes that the standard algorithm is not an algorithm based on place value and the properties of operation. What exactly is it based on if not those?"[/quote]
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