To find the GCF of two numbers you first need to split them into their prime factors. In this case:
63 = 3x3x7
77 = 7x11
The next step is identifying any common factors. The only common prime factor is 7. Therefore the GCF of 63 and 77 is 7.
The GCF is 7.
The GCF of 35 and 63 is 7.The GCF is 7.The GCF is: 77
The GCF is 7.
The GCF is 7.
The GCF is 7.
The GCF is: 63
The GCF is 21.
The GCF is 7.
The GCF is 77.
The GCF is 11.
The GCF is 11.
The GCF is 11.