This week in P2 we have been working with British coins. So far, we can add up coins and count the total; we can choose the correct coins to buy something; we can do that in different ways and finally, we’ve been trying to learn to work out change. This last thing, working out change has been quite difficult for us. Mrs Cameron thinks it might be because we, ourselves, don’t really use money yet and we mostly see grown-ups using cards to pay for things in shops now.
We have compared working out change to other sums we do know how to do. We know how to work out the difference between 2 numbers and we are really good at missing number sums eg
9+_=15
Working out change is the same as these. If we have a 20p coin and we want to buy something that is 14p, we know these numbers are not the same. They are different and we need to work out the difference between them and when we do, that is the change we should get.
It’s good to use lots of different strategies to get our answers so this week we have used, ‘drawing empty number lines’; ‘counting on or counting back in our heads’ with actual money and ‘concrete items’ (towers of cubes)
With the cubes, we had a tower of 20 to represent the 20p piece and we made other towers for the cost of the items. When we compared the towers together, we could see the difference and we knew that was the change we should get. Once we’d done that, we wrote what we had done as a sum.