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Method 1:
\List the factors of each number.
\Factors of 9: 3, 3
\Factors of 15: 3, 5, 15
\Factors of 24: 2, 3, 4, 6, 8, 12, 24
\Identify the greatest common factor.
\The greatest common factor of 9, 15 and 24 is 3.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
Method 2:
\Write the prime factorization of each number.
\9 = 3 × 3 .
\15 = 3 × 5.
\24 = 2 × 2 × 2 × 3.
\The GCF is the product of the common prime factors in each number.
\GCF = 3.
\The greatest common factor of 9, 15 and 24 is 3.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The greatest common factor of 9, 15 and 24 is 3.