The GCF is 21.
The GCF is 21.
The GCF is 42.
The GCF of 84, 63 and 42 is 21.
The GCF of 42 and 84 is 42.
The GCF is 7.7 is the GCF of 42, 49 and 84.
The GCF of 42, 105 and 112 is 7.
The GCF is 21.
The GCF is 7.
The GCF is 7.
The GCF is 6.
The GCF is 6.