**Greatest Common Factor (GCF) of 3 and 9**

We here at the Fraction Calculator often determine the Greatest Common Factor (GCF) for numbers such as 3 and 9, because we use the GCF to lower the denominators of our fractions.

The Greatest Common Factor of 3 and 9 is the greatest number (factor) that you can evenly divide both 3 and 9 by.

To find the Greatest Common Factor of 3 and 9, we first have to identify all the factors of each number. Then we see which factors they have in common, and finally we pick the largest number they have in common, which is the Greatest Common Factor (GCF) of 3 and 9.

The factors of 3 are 1 and 3. The factors of 9 are 1, 3, and 9. The highest factor they have in common is 3. Therefore, the Greatest Common Factor (GCF) of 3 and 9 is as follows:

**GCF(3,9) = 3**

**Greatest Common Factor Calculator**

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**Greatest Common Factor (GCF) of 3 and 10**

Here is the next set of numbers we have calculated the GCF for. Check it out!