![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
Method 1:
\List the factors of each number.
\Factors of 4: 2, 4,
\Factors of 12: 2, 3, 4, 6, 12
\Factors of 10: 2, 5, 10
\Identify the greatest common factor.
\The greatest common factor of 4, 12 and 10 is 2.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
Method 2:
\Write the prime factorization of each number.
\4 = 2 × 2 .
\12 = 2 × 2 × 3.
\10 = 2 × 5.
\The GCF is the product of the common prime factors in each number.
\GCF = 2.
\The greatest common factor of 4, 12 and 10 is 2.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 4, 12 and 10 is 2.