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8 December, 20:00

Which property or properties of arithmetic do you use when you calculate 3*70 by first calculating 3*7 = 21 and then putting a zero on the end of 21 to make 210? Write equations to show which properties are used and where

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  1. 8 December, 23:06
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    The property used is the Associative property

    3 * 70 = 3 (70) = 3 (7*10) = (3*7) * 10

    The formula is

    a * bc = a (bc) = a (b*c) = (a*b) * c
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