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Greatest Common Factor

The greatest common
factor, or GCF, is the greatest factor that divides two numbers. To find the GCF
of two numbers:

:

List the prime factors of each number.:

Multiply those factors both numbers have in common. If there are no common prime factors, the GCF is 1:

Ex: prime factor of 12: 2 x 2 x 3 Prime Factor of 18: 2 x 3 x 3

There is one 2 and one 3 in common. :

The Greatest Common Factor (GCF) is 2 x 3 = 6:

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