The GCF is 9.
The GCF is 9.
The GCF is 9.
The GCF is 9.
The GCF is 9.
The GCF is 9.
GCF(90, 63) = 9
The GCF is 9.
The GCF is 9.
The GCF is 9.
The GCF is 9.
Since 9 is a factor of 90, it is automatically the GCF.
Since 9 is a factor of 18, it is automatically the GCF.