Make an organized list with the factors for each number.
12
Practice makes perfect
The greatest common factor (GCF) is the greatest number that is a factor of two or more numbers. To find the GCF, we will make an organized list of the factors for each number.
Given number
Common factors
48
1, 2, 3, 4, 6, 8, 12, 16, 24, and 48
60
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60
In the table we can see that the GCF is 12 because it is the greatest factor that 48 and 60 share.
