The GCF, or greatest common factor, of 18 and 63 would be 9.
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The GCF is 6.
The GCF is 9.
If you mean 18, 27 and 63 then the GCF is 9
The number 9 would be the GCF, or greatest common factor, of 18 and 63.
The GCF is: 63