3. Comparing and Ordering Fractions, Decimals, and Percents
Sign In
The greatest common factor (GCF) is the greatest factor shared by two or more numbers.
17
The greatest common factor (GCF) is the greatest number that is a factor of two or more numbers. The first step for finding a GCF is to list the factors of the numbers. Then we can find which one is the greatest.
| Given Numbers | Factors | GCF |
|---|---|---|
| 51 | 1, 3, 17, 51 | 17 |
| 85 | 1, 5, 17, 85 | 17 |
The GCF of 51 and 85 is 17.