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38 x 81

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38 x 81

3078

Start with 40 x 80 = 3200. That's forty 80's, so subtract 80 + 80 = 160, and we get 38*80 = 3040. Now, that's eighty 38's, and we want one more, so add 38: this gives us 81(38) = 3040 + 38 = 3078.

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