Answer :
We can find the GCF by using the factorization method.
The factors of 20 are:
[tex]1,2,4,5,10,20[/tex]The factors of 88 are:
[tex]1,2,4,8,11,22,44,88[/tex]The common factors are 1, 2, and 4.
Therefore, the greatest common factor, GCF, of 20 and 88 is 4.