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The greatest common factor, or GCF, is the greatest factor that divides two numbers. To find the GCF of two numbers:
  1. List the prime factors of each number.
  2. Multiply those factors both numbers have in common. If there are no common prime factors, the GCF is 1.

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 ·  Factors and
    multiples

 ·  Greatest
    Common Factor (GCF)

 ·  Least Common
    Multiple (LCM)


First Glance In Depth Examples Workout
First Glance   In Depth   Examples   Workout

Greatest common factor (GCF)