The factors of 77 are: 1, 7, 11, 77
The factors of 51 are: 1, 3, 17, 51
The only common integer factor of 77 and 51 is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 1.
The GCF is 7.
The GCF is 77.
The GCF is 11.
The GCF is 11.
The GCF is 11.
The GCF of 77 and 91 is 7.
GCF(56, 77) = 7.
The GCF is 3.