The factors of 28 are:
1, 2, 4, 7, 14, 28
The factors of 78 are:
1, 2, 3, 6, 13, 26, 39, 78
The common factors are:
1, 2
The Greatest Common Factor (GCF) is: 2
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The greatest common factor (gcf) of 28 and 36 is 9.
The GCF is 4.
The GCF of 28, 36 and 52 is 4.
The GCF of 20 and 28 is 4
The GCF is 4x.