Divide Whole Numbers by 10, 20 and 30

Welcome to our Division by 10, 20, and 30 Worksheets!

Below you’ll find a variety of worksheets. The one thing they have in common is that all of the problems require students to divide a 3-digit number by 10, 20, or 30. However, they differ in two ways.

Some worksheets include 16 questions while others include 20.
Some worksheets include whole-number answers while others include decimal answers.

Dividing by multiples of 10 is a great way for students to enhance their mental math skills. Solving the problems in these worksheets will give students the confidence they need to tackle harder division problems.

Don’t forget to check out our other Division worksheets!

Resource Details

Age(s): 8 - 11
Grade(s): 3rd Grade to 6th Grade
12 Printable PDF Resources
Includes Answer Key(s)

How do you divide by 10 mentally? What is the shortcut for dividing by 10?

Dividing by 10 is so simple! All you need to do is move the decimal one place to the left.

Example: Find the solution to 520 divided by 10.
- There’s an invisible decimal at the end of every whole number, so 520 can be rewritten as 520.
- If we move the decimal one place to the left we’ll get 52.0
- 520 divided by 10 equals 52

Example: Find the solution to 242 divided by 10.
- Rewrite 242 as 242.
- Move the decimal left one place to get 24.2
- 242 divided by 10 equals 24.2

How do you divide by 20 mentally? What is the shortcut for dividing by 20?

Dividing by 20 is almost as simple as dividing by 10! You can use long division, but if you want to divide in your head just follow these two steps:
- Divide the number in half.
- Then move the decimal one place to the left.

Example: Find the solution to 520 divided by 20.
- First, divide 520 in half. That will give you 260.
- Place a decimal at the end of 260, then move it one space to the left.
- You’ll end with 26.0
- 520 divided by 20 equals 26

Example: Find the solution to 242 divided by 20.
- First, divide 242 in half. That will give you 121.
- Place a decimal at the end of 121, then move it one space to the left.
- You’ll end up with 12.1
- 242 divided by 20 equals 12.1

How do you divide by 30 mentally? What is the shortcut for dividing by 30?

Dividing by 30 follows the same steps as dividing by 20. You just start by dividing by three instead of two. To divide by 30 in your head:
- Divide the number by three.
- Then move the decimal one place to the left.

Example: Find the solution to 906 divided by 30.
- First, divide 906 by three. That will give you 302.
- Place a decimal at the end of 302, then move it one space to the left.
- You’ll end with 30.2
- 906 divided by 30 equals 30.2

Example: Find the solution to 641 divided by 30.
- First, divide 641 by three. That will give you 213.67.
- Now move the decimal one space to the left.
- You’ll end up with 21.367 or 21.37 if you round to the nearest hundredth.
- 641 divided by 30 equals 21.37

Divide the Whole Numbers by 10, 20 and 30 (Printable PDFs)

Choose the problems your students will need from this bank of “divide by multiples of 10 worksheets.” The first six worksheets will produce whole-number answers. The second six will produce decimal answers. To help, we’ve provided an answer key for each worksheet!