Multiplying by 2The double strategy is to simply take the number you're multiplying by 2 and just double it! 2 x 16 1) Double fo your answer: 16 + 16 = 32 2 x 16 = 32 Multiplying by 4The "double double" strategy. You take the number you're multiplying by 4, then double it, then double it again. 4 x 16 1) Double: 16 + 16 = 32 2) Double your answer: 32 + 32 = 64 4 x 16 = 64 Multiplying By 8The "double double double" strategy. Take the number you're multiplying by 8, then double it. Take that sum and double that. Then double it one last time.
8 x 16 1) Double: 16 + 16 = 32 2) Double your answer: 32 + 32 = 64 3) Double that answer one last time: 64 + 64 = 128 8 x 16 = 128
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