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13 x 42

learning

13 x 42

546

Well, 13 = 10 + 3, so 42(13) = 42(10 + 3) = 420 + 126 = 546. ----Alternately, take a factor of 3 away from 42, so it becomes 14, and give it to 13, so it becomes 39. Then 42(13) = 14(39) = 14(40 - 1) = 560 - 14 = 546.

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13 x 42

13 x 42