What is the gcf of 18 and 30?

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

To find the GCF, you can list all the factors of each number and then identify the largest factor that is common to both numbers.

The factors of 18 are: 1, 2, 3, 6, 9, 18 The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30

The largest factor that is common to both 18 and 30 is 6, making 6 the greatest common factor.