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9 July, 23:11

What is the greast comma factor of 21 and 40

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  1. 9 July, 23:39
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    List the factors:

    21: 1, 3, 7, 21

    40: 1, 2, 4, 5, 8, 10, 20, 40

    They only have 1 in common.

    So 1 is the greatest common factor.
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