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The GCF of 20 and 76 is 4.

To find the greatest common factor, you have to list the factors of both numbers. 20- 1,20 2,10 4,5 72- 1, 72 2,36 3,27 4, 18 8,9 If you want to, put them in order. However, since a lot of people are lazy, this step isn't really needed. Now all you have to do is look for the biggest number that's in both lists. In this case, it is 4.

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9y ago

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