## The Lesson

A number line can be used to add numbers.Imagine we wanted to add

**4**and

**3**.

## How to Add on a Number Line

Adding on a number line is easy.## Question

Use a number line to find**4 + 3**.

## Step-by-Step:

# 1

Find

**4**on the number line.**4**+ 3

# 2

Move

**3**to the**right**along the number line.
4

**+ 3**# 3

Read off the number you have reached.

## Answer:

4 + 3 =**7**

## Top Tip

## To Add, Go Right

**Adding**means going

**right**on a number line.

## Note

## The Order of Adding Doesn't Matter

In our example, we have found**4 + 3**.

But the order in which we add the numbers doesn't matter... we can swap the numbers around:

**4 + 3 = 3 + 4**

*commutative*property of addition: you can change the order of the numbers around the sign and still get the same answer.