Factors of 21 to 40.
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the factors of 21 are 21,7,3,1. the factors of 40 are 40,20,10,8,5,4,2,1.
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The gcf of 21 and 40 can be obtained like this: The factors of 21 are 21, 7, 3, 1. The factors of 40 are 40, 20, 10, 8, 5, 4, 2, 1. The common factors of 21 and 40 are 1, intersecting the two sets above.
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