Math Dictionary / Greatest Common Factor
Greatest Common Factor
The greatest common factor is the largest factor shared by two or more numbers.
Number SystemGrade 5Grade 6Grade 7Grade 8GED
What it means
It is often used to simplify fractions or factor expressions.
Also called: GCF
Examples
| GCF of 12 and 18 is 6 |
| GCF of 8 and 20 is 4 |
| Use common factors to simplify fractions |
Common mistake
The greatest common factor is a factor, not a multiple.
Try one
Question: What is the GCF of 10 and 15?
Show answer
5.