Why is it useful to know the divisibility of a number? It allows us to determine whether a number is divisible by another number without having to divide them. In this post, we are going to learn **the ****divisibility guidelines for 9.**

**Criteria for divisibility by 9: **

**A number is divisible by 9 if the sum of its digits is 9 or a multiple of 9. **

For example:

#### is 2610 divisible by 9?

In order to find out **we add its digits:**

2+6+1+0=9

Therefore 2610 is divisible by 9.

Another example:

#### is 965 divisible by 9?

We add all the digits:

9+6+5=20

Since 20 is not divisible by 9, then 965 is not divisible by 9.

To keep learning:

Divisibility guidelines for:

If this explanation has helped you, share it with your friends on Facebook, Twitter, or via email so that they can also learn when a number is divisible by 9.

And if you want to learn more elementary math, try Smartick for free!

### Learn More:

- Divisibility Guidelines for 6 and Some Examples
- Divisibility Guidelines for 6, 8 and 12
- Divisibility Guidelines for 2, 5, and 10
- Divisibility Guidelines for 7 and Some Examples
- Follow the Divisibility Guidelines for 3

#### Latest posts by Smartick (see all)

- What Is an Angle? How Is It Made? - 10/14/2019
- Frustration and Failure as Instruments of Education - 10/11/2019
- Motivation – Evidence Based Education - 10/07/2019