Question

What is the GCF of 32+20 and the Gcf of 18+27

Answer 1

32+20=52 
18+27=45
Factors of 52 are: 56,2613,4,2,1
Factors of 45 are: 45,15,9,5,3,1

The common factors they have are 1

GCF= 1

Answer 2

      32                20
    4     8          4      5
  2 2 2 2 2      2 2

The greatest common factor is 4


The GCF of 18 and 27 is 9, because it is the highest factor of both the numbers (besides the # itself).