What is the greatest common factor (GCF) of 80 and 100?

20

Step-by-step explanation:

The factors of 80 are : 1, 2, 4, 5, 8, 10, 16, 20, 40, 80

The factors of 100 are : 1, 2, 4, 5, 10, 20, 25, 50, 100

The common factors are : 1, 2, 4, 5, 10, 20

The greatest common factor is 20

20.

Step-by-step explanation:

We found the factors and prime factorization of 80 and 100. The biggest common factor number is the GCF number. So the greatest common factor 80 and 100 is 20