Definition
The greatest common factor (GCF) is the largest number that divides evenly into two or more numbers. It is used to simplify fractions.
List all the factors of each number. The biggest number that appears in both lists is the GCF.
Examples
- The GCF of 12 and 18 is 6.
- The GCF of 8 and 12 is 4.
- The GCF of 15 and 25 is 5.