The factors of 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
The factors of 90 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
The common factors are: 1, 2, 3, 6, 9, 18
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The Greatest Common Factor is 18
The greatest common factor (GCF) is: 9.
The GCF is 6.
6
The greatest common factor of 90 and 130 is 10.