Answer:
20
Step-by-step explanation:
The Greatest Common Factor (GCF) for 20 and 80, notation CGF(20,80), is 20. Explanation: The factors of 20 are 1,2,4,5,10,20; The factors of 80 are 1,2,4,5,8,10,16,20,40,80.
The factors of 20 are: 1, 2, 4, 5, 10, 20
The factors of 80 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
Then the greatest common factor is 20.
