Question

How do you find the gcf 15 18 30?

Answer 1

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: `3*5` and `15*1`.

`18`'s Factors Are: `3*6` and `2*9` and `1*18`.

`30`'s Factors Are: `3*10` and `1*30`.

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`.