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Anonymous
The factors of 20 are: 1, 2, 4, 5, 10, 20
The factors of 60 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
The common factors are: 1, 2, 4, 5, 10, 20
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The GCF is 20.
The GCF is 5.
The greatest factor common to 20, 60, and 180 is 20 .
GCF = 20