List the factors for 6 and List the factors for 18, then list the common factors and the Greatest Common Factor for 6 and 18
The factors of 6 are: 1, 2, 3, 6.
The factors of 18 are: 1, 2, 3, 6, 9, 18.
The common factors of 6 and 18 are: 1, 2, 3, 6.
The greatest common factor of 6 and 18 is 6.