Factors of 60:
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
Factors of 51:
1, 3, 17, 51.
The answer is 3.
The GCF is 3.
The GCF is 3.
The GCF is 3.
The GCF is 3.
The GCF is 1.
The GCF is 1.
The GCF is 17.
The GCF is 1.
The GCF for 29 51 is 1.
The GCF of 42 and 51 is 3.
255 = 51 x 5 so 51 is GCF
The GCF of 39 and 51 is 3.3