1 x 12
2 x 6
3 x 4
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I think you are thinking of using the rectangles like you use Punnet squares. One side is multiplied times the other side and the product is put in the inside squares. This is handy when trying to factor expressions that are polynomials.
The greatest common factor of 12 and 20 is 4
A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.
The greatest factor of any number is the number itself. The greatest common factor of 8, 12 and 20 is 4.
The Greatest Common Factor (GCF) is: 12