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What strategy would you use to solve these facts involving 3 and 7? 8 x 3 7 x 4
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What strategy would you use to solve these facts involving 3 and 7?
8 x 3      7 x 4

User Pouryak
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8\cdot3=7\cdot3+3\\ 7\cdot4=7\cdot3+7
User Rtome
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