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Tricky Twelves


Found in: math; mnemonics

A student taught me a 12's trick a few years ago for multiplying numbers two through nine by twelve.

Here it is:

11 x n +n = 12 x n

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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