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The greatest common factor is the highest number that divides exactly into two or more numbers.

18: 1, 2, 3, 6, 9, 18

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

The GCF for 18 and 40 is 2.

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GCF(18, 40) = 2.

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7y ago
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Q: What is the greatest common factor of 18 and 40?
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