What is the greatest common factor of both 9 and 12?

1 Answer
Teun
Dec 14, 2016

3

Explanation:

The greatest common factor is the largest number that two numbers can both be divided by to yield a whole number. 9/3 = 3 and 12/3 = 4.

By making factor trees you can identify the largest common factors of two numbers. 9 = 3*3 and 12 = 2*2*3, in this case the only common factor is 3 and therefore the greatest.

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