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It is because 3 is a factor of 9.

So if 9 is a factor of some number X, then X = k*9 for the factor pair 9 and k

But X = k*9 = k*(3*3) = (k*3)*3 so that X is k*3 times 3 ie it is a multiple of 3.

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10y ago

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Because 3 is a factor of 9.

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9y ago
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Q: Why does every number with 9 have 3 as a factor?
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