Find the greatest common factor.

1. 12 and 16

The two numbers (12 and 16) share common factors (1, 2, 4). The greatest of these is 4 and that is the greatest common factor. Or

Answer:

GCF = 1

for the values 1, 12, 16

Solution by Factorization:

The factors of 1 are: 1

The factors of 12 are: 1, 2, 3, 4, 6, 12

The factors of 16 are: 1, 2, 4, 8, 16

Then the greatest common factor is 1.