# How can I use adding and subtracting to work out change?

## Pounds and pence

Money comes in **pounds** and **pence**. **One pound** is the same as **100 pence**.

Pounds are written with a **£ before the number**:

- for example
**two pounds**is written as**£2**.

Pence are written with a **p after the number**:

- for example
**twenty pence**is written as**20p**

Sometimes pounds and pence are written together as **£** then the **number of pounds** then a **dot** then the **number of pence**.

- for example
**one pound and fifty pence**is written as**£1.50**

## How do you add and subtract money?

If you are just working with pounds, or just working with pence, you can add and subtract just like with ordinary numbers.

If you are working with pounds and pence, remember that **100p=£1**

**Bridging through 100** can help. Here's what to do:

work out what you need to add to your first number of pence to

**make 100****add 1 to the pounds**for the**100 pence**subtract what you added from the second number

the number you have left says how many pence you have

add this to the number of pounds you have for the final answer

### Example

What is **70p + 40p?**

What do you need to add to **70p** to make **100p**?

**70p + 30p = 100p**

This makes **£1**.

Take **30p** away from **40p**

**40p - 30p = 10p**

Add this to the pounds to make **£1.10p**