# Round numbers to the nearest 10, 100 and 1000

## Learning focus

Learn about rounding numbers up or down to the nearest 10, 100 or 1000.

This lesson includes:

- a catch-up quiz
- a learning summary
- two videos
- two activities

## Quiz

To get started, let's see how well you know this topic already. Take the catch-up quiz below to find out.

# Learn

Learn about rounding numbers to the nearest 10, 100 or 1000 with Albert and his jars of sweets!

## The rule for rounding

Always look at the digit to the right of the one you’re supposed to be rounding to:

- if it is 5 or more, then
**round it up** - if it is less than 5, then
**round it down**

To round a number to the nearest **10**, look at the amount of ones. If this is 5 or more, round up. If it is 4 or less, round down.

## Example 1

**Round 1289 to the nearest ten.**

First, look at the ones digit:

128*9*

9 is greater than 5, so you **round up**.

So 1289 rounded to the nearest ten is *1290*.

The number line below also shows you how much closer 1289 is to 1290.

To round a number to the nearest **100**, look at the tens digit. If the tens digit is 5 or more, round up. If the tens digit is 4 or less, round down.

## Example 2

**Round 2233 to the nearest hundred.**

Look at the tens digit:

22*3*3

3 is less than 5, so you **round down**.

2233 rounded to the nearest hundred is *2200*.

To round a number to the nearest **1000**, look at the hundreds digit. If the hundreds digit is 5 or more, round up. If the hundreds digit is 4 or less, round down.

## Example 3

**Round 5432 to the nearest thousand.**

Remember to look at the hundreds digit:

5*4*32

4 is in the hundreds column, so you **round down**.

5432 rounded to the nearest thousand is 5000.

Even when numbers get larger, you can still apply the same rules to round - just look at the digit to the right of the value you are rounding to!

Follow this **BBC Supermovers** video with Laura Bubble to find out more about rounding numbers up and down!

# Practise

## Activity 1

Now you've found out more about rounding numbers, try this activity. Round the numbers to the nearest 10 by replacing the labels.

## Activity 2

Now see if you can round these numbers to the nearest 10... then round up numbers to the nearest 100!

# 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.