What is the greatest common factor of 6 and 27?

The GCF for 6 and 27 is 3.

The factors for 6 are 1, 2, 3, and 6

The factors for 27 are 1, 3, 9, and 27

So the GCF is 3.

6 are: 1,2,3 and 6

27 are: 1,3, and 9

Both of the multiples have 3 so the answer is 3.