# Subtract two 3-digit numbers

## Learning focus

In this lesson, you will learn how to subtract two three-digit numbers.

The lesson includes:

- one catch-up quiz
- one learning summary
- one video
- two interactive activities
- two worksheets

# Quiz

Test your knowledge of subtracting two 3-digit numbers in this quick quiz.

# Learn

Do you know how to subtract numbers from each other? Find out by watching this short animation featuring a terror from the deep from KS2 Maths.

## Checklist

When subtracting 3 digit numbers it is useful to use this checklist:

**Write the numbers in columns.**Separate the numbers into ones, tens and hundreds. Always start with the ones first.**Estimate first and check afterwards.**Estimate a rough answer first, then work out your actual answer.**Subtraction is the opposite to addition.**So subtraction can always be checked by adding. Check that 182 - 37 = 145 by doing the sum: 145 + 37 = 182Look out for these words in problems:

**take away**,**difference**,**less than**,**minus**,**decrease**,**fewer than**,**reduce**. They all mean subtraction.

## Column subtraction

The column method is a great way to do subtraction.

## Example 1

**What is 548 - 125?**

## Example 2

**What is 343 - 237?**

When using a place value column to subtract two large numbers, sometimes the second number will be larger than the first. This means it cannot be directly subtracted. You need to exchange a digit from the next column.

This example shows how it works:

The column method can be applied to help you solve word problems. Remember to look for the words that mean subtraction.

## Example 3

**Lottie has £628 to spend. She buys a new bike which costs £446. How much money does Lottie have left?**

The word **left** tells you that this is a subtraction problem.

# Practise

## Activity 1

**Simple subtraction**

Click on the image below to see if you can subtract the numbers correctly.

## Activity 2

**Some more simple subtraction**

Click on the image below to see if you can subtract the numbers correctly.

# Play

Play **Guardians: Defenders of Mathematica** to learn more and sharpen your skills on this topic.

# There's more to learn

Have a look at these other resources.