Question

The GCF of 18 and 30 is ____.

Answer 1

6

Explanation:

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

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

Then the greatest common factor is 6.

Answer 2

Answer: 6

The factors of 18 are 18, 9, 6, 3, 2, 1. The factors of 30 are 30, 15, 10, 6, 5, 3, 2, 1. The common factors of 18 and 30 are 6, 3, 2, 1, intersecting the two sets above.