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What's the greatest common factor and least common factor of 4,20?

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What's the greatest common factor and least common factor of 4,20?

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  1. 4 x 5 = 20, so 20 is exactly divisible by 4. It follows that the greatest common factor of 4 and 20 is 4.

    Did you mean 'least common multiple'? The least common multiple of 4 and 20 is 20, for the same reason.

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