The GCF of 18 and 27 is 9.
The GCF is 3.
The GCF is 1.
The GCF is 3.
The GCF of 18, 27, and 78 is 3.18=2*3*327=3*3*378=2*3*13GCF=3
The GCF is 9.
The GCF is 3.
The GCF is 3.
The gcf of 27, 45, 63 and 90 is 18 Hope It Helps:)
If you mean 18, 27 and 63 then the GCF is 9
If you mean 18, 27 and 63 then the GCF is 9
The GCF is 1.