Solve Money Problems with Addition and Subtraction

In this activity, we will be going to the shops!

 

We will need to use addition to work out how much items cost and we will need to use subtraction to find out how much change we will get. 

 

Here is our shop with the cost of each item. 

 

   10p   50p

   £1        36p 

   85p    £2

 

How much would it cost to buy a toy car and a toy train?

 

The first thing we need to do is look at the cost of each item. 

A toy car is 36p and a toy train is 85p. 

 

Now we need to add these together:

85p + 36p = 

 

We could work this out by adding the tens and then the one:

 

Tens: 80 + 30 = 110

Ones: 5 + 6 = 11

Total: 110 + 11 = 121

 

Then we need to put the p back on so it is 121p

Remember 100p = £1 

So, this could also be written as £1.21 but both answers are correct! 

 

You went to the shop with £1 and bought a crayon, how much change will you have left?

Let's start by looking at how much the crayon costs. It is 10p 

If we start with £1 and spend 10p this is a subtraction:

 

£1 - 10p = 

 

Let's convert the £1 to pennies to make this easier to solve:

 

100p - 10p = 90p 

 

We will have 90p change. 

 

Ok, are you ready to have a go at these questions and spend some money??