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4–1EXAMPLE Find the GCF by Using Prime FactorsFind the GCF of 52 and 78.METHOD 1 Write the prime factorization.5278· 26· 39· ·· ·REMEMBER ITPrime factorization iswriting a compositenumber as a product ofprime numbers.2 and 13 are common factors.METHOD 2 Divide by prime numbers.2 326 39 52 78Divide both 52 and 78 by 2.Then divide the quotients by 13.Using either method, the common prime factors areCopyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.and . So, the GCF of 52 and 78 is× or .Check Your Progress Find the GCF of 64 and 80.Math Connects, Course 1 89