Subtraction is the opposite of addition, so adding and then subtracting the same amount gets you back where you started. A group of children shows how this can be useful when you go shopping.

First broadcast:
11 September 2007

This clip would be useful when learning about number operations and the relationship between them. It helps pupils to recognise that subtraction is the opposite of addition. The children could be given a menu with all items costing full pounds without pence. The children could be told that they have £10 to spend. They could select items from the menu and then find the total. They could then calculate their change. To extend the activity, the menu could have items priced in multiples of 50p, or children could have more money to spend.