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Method 1:
\List the factors of each number.
\Factors of 36: 2, 3, 4, 6, 9, 12, 18, 36
\Factors of 4: 2, 4
\Identify the greatest common factor.
\The greatest common factor of 36 and 4 is 4.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
Method 2:
\Write the prime factorization of each number.
\36 = 2 × 2 × 3 × 3.
\4 = 2 × 2.
\The GCF is the product of the common prime factors in each number.
\GCF = 2 × 2 = 4.
\The greatest common factor of 36 and 4 is 4.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 36 and 4 is 4.