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Math and Arithmetic
Factoring and Multiples

What is the greatest common factor of 8 an 12?

Answer

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Wiki User
October 01, 2009 4:41PM

4

Look at the prime decompositions of each

8 = 2*2*2
12 = 2*2*3

Now look at all the terms in common.
They both have at least two 2's.
They share a factor of 4.
What is left after removing 4?
8/4 = 2
12/4 = 3
There is nothing left in common now.
So the greatest common factor is 4.