The factors of 70 are: 1, 2, 5, 7, 10, 14, 35, 70
The factors of 20 are: 1, 2, 4, 5, 10, 20
The common factors are: 1, 2, 5, 10
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20
The GCF is 20.
Factors of 40: 1, 2, 4, 5, 8, 10, 20, 40.Factors of 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80.Factors of 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60.GCF (40, 80, 60) = 20
The greatest common factor of 60, 80, and 100 is 20
Since 20 is a factor of 80, all of its factors are common.