The number 9 would be the GCF, or greatest common factor, of 18 and 63.
For 53, 33, 18 the GCF is: 1
The GCF is 9.
9w
The GCF is 6.
The GCF is 9.
The GCF is 4.
The GCF is 30.
50
The GCF is 1.
The GCF is 27.
The GCF is: 1
The GCF is 5.
The GCF is 2.
The GCF is 3.
The GCF of 125, 200 is 25.