What is the greatest common factor of 27 and 48?

The greatest common factor of 27 and 48 is 3
The factors of 27 are:

1, 3, 9, 27

The factors of 48 are:

1, 2, 3, 4, 6, 8, 12, 16, 24, 48

The common factors are:

1, 3

The Greatest Common Factor:

GCF = 3