How do you find the gcf 15 18 30?

1 Answer
Principal
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: #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#.

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