What is the greatest common factor of 18 27 and 45?

The GCF of 18 27 and 45 is 9.

The factors of 18 are 1, 2, 3, 6, 9, and 18

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

The factors of 45 are 1, 3, 5, 9, 15, and 45

The common factors are 1, 3, and 9

The greatest common factor is 9

The GCF is 9.