What is the greatest common factor of 18 and 30?

The greatest common factor (GCF) of 18 and 30 is 6.

To find the GCF, you can list the factors of each number and look for the largest number that appears in both lists.

Factors of 18: 1, 2, 3, 6, 9, 18

Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30

The largest number that appears in both lists is 6, so the GCF of 18 and 30 is 6.