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Prime Factorization and Greatest Common Factor - PreAlgebraCoach.com

numbers. Greatest common factor (GCF) is also known as greatest common divisor (G.C.D) and highest common factor (HCF). Finding the GCF using Prime factorization: 1. List the prime factors for each number. 2. Find the Prime Factors they have in common. 3. Multiply the factors common to both numbers and the answer is GCF. 4. If there are no ...