How do I find the Greatest common factor?

1. List the prime factors of each number

2. Multiply those factors both factors have in common. If there are no common prime factors the GCF is 1.

Step-by-step explanation:

Use the factor tree method

factors of a number are those numbers that can divide the number exactly without leaving a reminder.

using 6 and 12 as an example

factors of 12 {1,2,3,4,6,12}

factors of 6 { 1,2,3,6}

then the common factor from both 6 and 12 are { 1,2,3,4,6}

and from this, the greatest common factor is 6.