The factors of 28 are:
1, 2, 4, 7, 14, 28
The factors of 76 are:
1, 2, 4, 19, 38, 76
The common factors are:
1, 2, 4
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The GCF is 4.
Since 28 is a factor of 84, it is automatically the GCF.
The greatest common factor of 28 and 72 is 4.
28 and 28
The GCF of 28 and 84 is 28.