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2 months ago
Fun Fast Multiplication Trick!
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Fun Fast Multiplication Trick! A neat trick ...
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i understand steps 1 and 3 and why that would work. but can you explain why step 2 works when you cross multiply? I love this trick, way fast! I would love to teach this strategy with some of my students, but I want to be able to explain why we do step 2 and how it works. Please help.