Find the greatest common factor between 64 and 80. Show your work.
To find the greatest common factor (GCF) between 64 and 80, we need to list the factors of each number and find the largest factor they have in common.
The factors of 64 are: 1, 2, 4, 8, 16, 32, 64.
The factors of 80 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80.
The common factors between 64 and 80 are: 1, 2, 4, 8, 16.
Therefore, the greatest common factor between 64 and 80 is 16.