![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
Greatest common factor (GCF) is a factor that is greatest among the
\common factors of the numbers.
\List the factors of each number.
\Factors of 12: 2, 3, 4, 6, 12
\Factors of 30: 2, 3, 5, 6, 10, 15, 30
\Identify the greatest common factor.
\The greatest common factor of 12 and 30 is 6.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 12 and 30 is 6.