4*2*2 is one
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The factor strings for 12 is 6*2 , 2*2*3, 4*3 if you are doing a chart than you put the length is how long the problem.
The factor pairs of 16 are (16,1)(8,2)(4,4). That's three ways to divide 16 evenly.
Well, isn't that a happy little math question! The greatest common factor, or GCF, is the largest number that divides evenly into all the numbers. Let's take a look at 16, 48, and 80. The GCF of these numbers is 16, because it's the largest number that can divide evenly into all three of them. Just like adding a happy little tree to a painting, finding the GCF brings harmony and balance to our numbers.
2 x 2 x 13
(16,1)(8,2)(4,4)