We sometimes have problems to solve that require us to use maths in order to solve them.

This could be addition, subtraction, multiplication, division or another area of maths.

In this activity, we are going to be **solving word problems using addition and subtraction. **

In most questions, we'll need to do two calculations!

Here is an example of a word problem:

Tommy had **50 **sweets in a bag.

He **gives 5** to his friend and **eats 10** himself.

**How many sweets does he now have?**

In this question, we need to **subtract 5 and 10 from 50** to find the answer.

The important information is highlighted for us - phew!

**When do we add numbers?**

We **add **when:

We increase amounts

Someone gives us something extra

We get more of something

**When do we subtract numbers?**

We **subtract **when:

We decrease amounts

We give away something

We spend money

Let's look at an example where we need to add and subtract:

A library had **250** books on Monday.

**65 were borrowed** on Tuesday.

**90 were returned** on Wednesday morning.

**How many books** were in the library on Wednesday afternoon?

**Answer:**

We know the library had **250** books at the start of the week and **65** were borrowed.

So, we need to **subtract 65 from 250**

**250 - 65 = 185**

**90** books were returned to the library, so we need to **add this to 185**

**185 + 90 = 275**

There were **275** books in the library on Wednesday afternoon.

Now, why don't you have a go at some questions?

Read each question carefully and think about what calculation you need to do!