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21 February, 17:50

What is the GCF of 40 and 21

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  1. 21 February, 18:17
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    The factors of 40: 1, 2, 4, 5, 8, 10, 20, 40

    The factors of 21: 1, 3, 7, 21

    The greatest common factor of 40 and 21 is 1.

    GCF = 1
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