# How to Find the Highest Common Factor of 9 and 15?

Are you in Year 7 or 8 and need to find the highest common factor of 9 and 15 for a school project? Our online math tutors will show you how to do just that in a few simple steps.

## To find the highest common factor of 9 and 15, you will need to:

• List out the factors of 9 and 15
• Compare the two lists of factors and find the highest number that appears on both lists

## How to find the factors of 9?

To find the factors of 9, you will need to:

• Think about what numbers can be multiplied together to equal 9

1 X 9 = 9

In the 2 times table, you won’t find 9.

3 X 3 = 9

In the 4 times table, you won’t find 9.

In the 5 times table, you won’t find 9.

In the 6 times table, you won’t find 9.

In the 7 times table, you won’t find 9.

In the 8 times table, you won’t find 9.

9 X 1 = 9

Hence, factors of 9 are 1, 3, and 9.

## How to find the factors of 15?

To find the factors of 15, you will need to:

• Think about what numbers can be multiplied together to equal 15

1 X 15 = 15

In the 2 times table, you won’t find 15.

3 X 5 = 15

In the 4 times table, you won’t find 15.

5 X 3 = 15

In the 6 times table, you won’t find 15.

In the 7 times table, you won’t find 15.

In the 8 times table, you won’t find 15.

In the 9 times table, you won’t find 15.

In the 10 times table, you won’t find 15.

In the 11 times table, you won’t find 15.

In the 12 times table, you won’t find 15.

In the 13 times table, you won’t find 15.

In the 14 times table, you won’t find 15.

15 X 1 = 15

Hence, the factors of 15 are 1, 3, 5, and 15.

### Now, we know:

The factors of 9 are 1, 3, 9.

The factors of 15 are 1, 3, 5, 15.

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October 7, 2022