A catchy song explains the use and appearance of the minus sign. The numbers 8 and 5 appear in a pool and the song tells the audience to look at the sign and work out what to do. The song explains what the minus sign looks like and tells them to subtract the second number from the first.

First broadcast:
5 November 2001

Use this clip at the start of a lesson to introduce the minus sign. Display a range of subtractions and additions and ask the children to shout out if they are subtractions. Discuss other words they may have heard or used, such as minus, take away, the difference. Create a classroom display with some of the words and some subtractions created by the children.