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The greatest common factor (GCF) of two (or more) numbers is the greatest factor that divides two numbers. To find the GCF you must work out and list the prime factors of each of the numbers. You will see that the numbers have prime factors in common. Multiply those factors the numbers have in common together and this gives you the GCF for the numbers.

eg Number A = 18, Prime factors = 2*3*3

Number B = 24, Prime factors = 2*2*2*3

The Prime factors that A and B have in common are 2 and 3

Multiply them together = 6

6= the GCF of 18 and 24

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