The Greatest Common Factor (GCF) is: 1
The GCF is 21.
The GCF is 7.
The GCF is 21.
The GCF is 21.
21. 42 = 2 x 3 x 7 63 = 32 x 7 105 = 3 x 5 x 7 gcf = 3 x 7 = 21
The GCF is 21.
The GCF is: 3
The GCF is 21.
The GCF is 21.
The GCF is 21.
The GCF is 7.
It is: 21