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Tricky Twelves


September 13, 2007

A student taught me the 12's trick a few years ago when multiplying numbers two through nine by twelve. Here it is: 12 x 2 = 22 + 2 = 24; 12 x 3 = 33 + 3 = 36;12 x 4 = 44 + 4 = 48;12 x 5 = 55 + 5 = 60;12 x 6 = 66 + 6 = 72;12 x 7 = 77 + 7 = 84;12 x 8 = 88 + 8 = 96; 12 x 9 = 99 + 9 = 108.

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