Little Juan needs new things for school. His mother takes him shopping and buys goods costing 15p. She only has a 20p piece, so what should she do? El Nombre explains that when the amount you give to pay is greater than the amount you owe, you need to be given change. He also explains that one 5p piece is worth the same as five 1p pieces.
Pupils can watch the clip and then, as a class, work out all the combinations which make 20p. A big 20p coin could be displayed on the board and pupils would have to raise their hands to volunteer a coin that they know could help make this up with smaller coins. Once this has been done, a price can be displayed on the board which is less than 20p. Pupils would then be asked to work with the teacher to work out how much change would be given, going back to the previous screen for help in doing this.