Squares of Differences: subtraction practice toward a greater purpose | math for love - 1 views
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Roland O'Daniel on 04 May 11Here is a phenomenal lesson, accessible to any child who knows how to subtract, and compelling to everyone, up to and including professional mathematicians. Get a kid engaged in it, and they'll do hundreds of subtraction problems without complaint, because it's helping them solve an honest mathematical mystery. I've seen this idea discussed in math education circles, but I haven't found any references to it online, so I want to share it here.