The factors of 6 are:
1, 2, 3, 6
The factors of 63 are:
1, 3, 7, 9, 21, 63
The common factors are:
1, 3
The Greatest Common Factor (GCF) is: 3
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The GCF is 6.
You need at least two numbers to find a GCF. If that's 6 and 27, the GCF is 3.
The GCF is: 63
The GCF is 9.
The Greatest Common Factor is 3