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Activity 4

Find change from 10p and 20p by counting up

 

You will need: 20p, 10p and 1p coins

 

Show the resource sheet “fruit change”: grapes 12p, banana 18p and apple 15p, and a 0–20p money line.

Give your child a 20p coin and ask which fruit snack they would like to buy.

Ask them to label the price, e.g. 12p, on the 1–20p money line.

 

Show the 20p coin held by your child. This is 20p. It is too much. How much change do I need to give back?

Ask your child to work this out by counting on from the 12p on the money line.

Hide the first 12 pennies and count the remainder.

Give your child eight 1p coins, one at a time, saying 13, 14, 15, 16, 17, 18, 19, 20p.

Point to the first 12 pennies. This is how much you spent on the snack.

Point to the eight remaining coins. This is how much you have left; the change you got from 20p.

 

Write: 20p –12p = 8p. Talk your child through this. We started with 20p and spent 12p. We have 8p change.

 

Repeat with the other two pieces of fruit.

Each time model counting up from the price, emphasising putting the price in our heads and counting on, either on the line or with the coins to 20p.

Show how the calculation can be written as a subtraction and talk them through it, e.g. 20p – 18p = 2p.

We started with 20p. We spent 18p. We got 2p change.

Now complete the “Check your change” worksheet.

 

Parents: These worksheets for this activity are differentiated, giving change from 10p, 20p, 50p or £1. 

Please choose the sheet most suited to your child.

 

Should you wish your child to find change within £1, we have posted a link to a powerpoint to help you.


Key questions
  • What do we add on to 12 to make 20? That’s the change you will get.

  • What subtraction can we write?

  • Why don’t we say the actual price when we are counting on with the pennies? We start with the next number!

 

Suggested activities:

 

Challenge 1:

Create a shop with prices between 10p and 20p. Take it in turns to act as a shopkeeper. First customer chooses an item to buy, and hands over a 10p coin. The shopkeeper uses a 0-10p money line (on yesterday's price resources sheet (1p to 10p)) to work out the change and pays this in pennies, counting on as they do so, e.g. saying 8p, 9p 10p so 3p change for 7p. Repeat this with prices above 10p and give change from 20p (on yesterday's  price resources sheet (1p to 20p)). Record each subtraction. Emphasise how we can count up or use our bonds to 10 and 20 to help us.

 

Challenge 2:

Put out purses with 10p and 20p coins and lots of pennies. Put some 2p and 5p coins in a till (or a pretend till made from a cardboard box). Label items in the shop with prices 2p−19p (using Blank price labels on resources sheet). Your child can go shopping with a 10p or 20p coin and buy one item at a time. The shopkeeper must give the correct change using counting up in pennies.

 

Challenge 3: 

Label items in a shop with the prices 4p, 7p, 12p, 15p, 41p and 43p. Find change from 10p, 20p and 50p using number facts and counting up. One person is the shopper (start with 10p); one is the shopkeeper (with 9 × 1p coins). First buy an item worth 4p. Ask the shopkeeper to give the correct change either by knowing 4 + 6 = 10 so 10 – 4 = 6 or by counting up from 4 to 10 in 1p coins. Repeat and buy something for 7p. Then ask your child to be the shopkeeper while you take the role of the customer. Shop for items costing 12p and 15p, using a 20p coin, and finally move on to shopping for items costing 41p and 43p using a 50p coin. Repeat. Remind your child to try and use number facts where they can, but to check using counting up in 1p coins. (Change should always be less than 10p.)

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