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I'm pretty sure that the homework was given as part of a course teaching multiplication. Perhaps what was desired was to first have children able to construct p

I'm pretty sure that the homework was given as part of a course teaching multiplication. Perhaps what was desired was to first have children able to construct products from repeated addition, before teaching them the commutative property?

chris_wot 11y ago
As I've said, that's a misuse of the repeated addition technique.
orless 11y ago
But 5 + 5 + 5 WAS repeated addition!