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42=2x3x7 56=2^3x7 72=2^3x3^2 so the GCF is 2 since we have a 2,3, and 7 in the first number and a 2 and a 7 in the second and a 2 and a 3 in the third. The common factors are (is) 2 The GCF is 2 Doctor Chuck
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What is the greatest common factor for 28 42 56?
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The greatest common factor is the highest number that divides exactly into two or more numbers. 21: 1, 3, 7, 21 42: 1, 2, 3, 6, 7, 14, 21, 42 56: 1, 2, 4, 7, 8, 14, 28, 56 63: 1, 3, 7, 9, 21, 63 The greatest common factor for 21, 42, 56 and 63 is 7.
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