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

32: 1, 2, 4, 8, 16, 32

56: 1, 2, 4, 7, 8, 14, 28, 56

72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72

The GCF of 32, 56 and 72 is 8.

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10y ago

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