1, 2, 3, 4, 6, 12
1, 3, 7, 9, 21, 63
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The GCF is 3.
The greatest common factor of 60 and 88 is 4.
The Greatest Common Factor of 21, 63, 84: 21
The highest common factor is 9
Since 7 is a factor of 63, it is automatically the GCF.