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12 March, 11:16

Waht is the gcf of 15 9 21

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  1. 12 March, 11:31
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    The gcf of 9, 15, and 21 is 3.

    We can do this many ways, but in this case it is easiest to write the factors of each number.

    9 has 1,3,9

    15 has 1,3,5,15

    21 has 1,3,7,21
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