What are the common factors and greatest common factor of 78 and 12?

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

The factors of 78 are: 1, 2, 3, 6, 13, 26, 39, 78

The common factors are: 1, 2, 3, 6

The Greatest Common Factor (GCF) is: 6