What is the gcf of 16 28 and 48?

The factors of 16 are:

1, 2, 4, 8, 16

The factors of 28 are:

1, 2, 4, 7, 14, 28

The factors of 48 are:

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

The common factors are:

1, 2, 4

The Greatest Common Factor (GCF) is:

4