# How do you find the greatest common factor of 12 and 18?

Dec 2, 2016

#### Explanation:

Divide both the number with a common number starting with 2 or 3 or 5 or 7 ....or so on which can divide commonly to both of the number.

Here

$12 , 18$
Divided both 12 and 18 by 2 hence $6 , 9$
Further divided both 3 and 9 by 3 hence $2 , 3$
Hence common factors are 2 and 3
$2 \cdot 3 = 6$

And greatest common factor among all the common number is 3.