Art Benjamin squares some (very large) numbers in his head and explains how he breaks the problem down in his head. The way he does it links to how (x+y)

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^{2}is multiplied out. At a lower level you can show what he's doing using the grid method.Direct Link

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Please do make any suggestions for improvement, variations that could be made, and let me know of any errors in the resources, or sections that students find confusing.