# Use Near Doubles to Add Numbers Mentally

In this worksheet, students will use ner doubles to add numbers mentally.

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Use Mental Addition/Subtraction to 1000

Difficulty level:

#### Worksheet Overview

In this activity, we are going to look at solving addition questions mentally.

This means that we need to find the answers using just our brains!

Luckily, there are lots of different strategies we can use to help us.

In this activity, we are going to use near doubles as a way of adding mentally.

Near Doubles

If we are given an addition question where the numbers are nearly the same, we can use our knowledge of doubling to help.

61 + 60 =

We can double 60 and then add 1

Double 60 is 120

120 + 1 = 121

Top Tip: To double 60, we can double 6 then multiply by 10

Double 6 = 12 x 10 = 120

Let's have a look at another example.

122 + 121 =

We can double 120  then add 2 + 1

Double 120 is 240

1 + 2 = 3

240 + 3 = 243

Top Tip: To double 120, we can double 12 then multiply by 10

Double  12 = 24 x 10 = 240

Now, why don't you have a go at answering some mental addition questions using this strategy?

### What is EdPlace?

We're your National Curriculum aligned online education content provider helping each child succeed in English, maths and science from year 1 to GCSE. With an EdPlace account you’ll be able to track and measure progress, helping each child achieve their best. We build confidence and attainment by personalising each child’s learning at a level that suits them.

Get started

Try an activity or get started for free

• National Tutoring Awards 2023 Shortlisted
• Winner - Private Tutoring
• Finalist
• Winner - Best for Home Learning / Parents