Hello there! The GCF of the two given numbers, 100 and 80 is 20.
Reminder: The Greatest Common Factor is the greatest number that is a factor of both terms given.
Factors of 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80.
Factors of 100: 1, 2, 4, 5, 10, 20, 25, 50, 100.
So, we need to find the biggest number that is both a factor of 80 and a factor of 100. Looking at the factors of each number, we can see that 20 is the biggest number that is a factor of both 80 and 100.
I hope this helps and have a great rest of your day! :)