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21 and 42 have a GCF of 21.

40 and 80 have a GCF of 40.

The GCF of 21 and 40 is 1.

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8y ago
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12y ago

They are 21 and 42

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11y ago

40 and 80, among others.

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Q: Which pair of numbers has a GCF of 21 40?
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