There are lots of ideas on your worksheet for developing your mental maths, see if you can do this shopping one only using addition and subtraction in your head. Make a toy shop and add price tags to your items up to 20p. Ask a member of your family to visit your shop. They can buy two items. Work out how much they need to pay. As an extra challenge, try to work out how much change they would get if they paid with a £1 coin!