How do you find the gcf 15 18 30?

1 Answer
Dec 20, 2016

The Greats Common Factor Is: 3

Explanation:

First, simply list out the factors that will multiply to give us each of the numbers. See below:

15's Factors Are: 35 and 151.

18's Factors Are: 36 and 29 and 118.

30's Factors Are: 310 and 130.

Now we have to ask ourselves, what number out of all three of these is the greatest common factor? All three of these numbers share a common factor and that is 3. They do not share any other factor.

Therefore, the greatest common factor of all these numbers is 3.

Answer: 3.