Carmen Lopera

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When first posed with the problem 15 × 15, we may generate the answer by applying a set of rules, e.g breaking the problem down into (10 + 5) × 15 and solving the subcomponents of these simpler multiplications first [2]. But after having solved this problem several times, we simply recall that the answer to 15 × 15 is 225. This(More)
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