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You are here: Home > Arithmetic > Multiply > The Rule of Nines – Multiplication

The Rule of Nines – Multiplication

Mnemonic Device:

9 x 3 = 27 (2 + 7 = 9)

Explanation: Between one times nine and nine times nine, the numbers in the result always add up to nine! (ie. 9 = 1+8, 2+7, 3+6, etc.)

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