4
Buying in the class shop
Learner’s Book 1: Unit 13, pp. 200–201
GoalUse coins to pay exactly for things in a class shop.
New words
price · how much something costsbuy · get something by giving money for itpay · give money to buy something
Explanation
In a class shop every thing has a price. The price tells us how much money we need. A pencil costs 5c. We can pay with one 5c coin. We can also pay with other coins that make 5c, like 2c, 2c and 1c. We count the value of the coins, not how many coins there are. Check the price first. Then choose coins that make exactly that price.
Our class shop
| thing | price |
|---|---|
| pencil | 5c |
| eraser | 2c |
| sticker | 1c |
| toy car | 10c |
Worked examples
A sticker costs 1c. We pay with one 1c coin.
Another way to pay 5c: a 2c coin, another 2c coin and a 1c coin. 2 and 2 make 4, and 1 more makes 5.
An eraser costs 2c and a sticker costs 1c. Together they cost 3c, so we can pay with a 2c coin and a 1c coin.
Class activity
Class shop: set up a shop with 6 things and put a price label (up to 20c) on each. One child is the shopkeeper and one is the buyer. The buyer chooses something and pays with paper coins. The shopkeeper checks that the coins make exactly the price. Swap roles.
Practice
1
A toy car costs 10c. Do these coins pay exactly 10c?
No. 5 + 2 + 2 = 9c, which is 1c short.
2
A ruler costs 6c. Show two different ways to pay exactly 6c with coins.
Any two, such as 5c + 1c, or 2c + 2c + 2c, or 2c + 2c + 1c + 1c.
3
How much money is there?
17c (10 + 5 + 2)
4
A pencil costs 5c and a sticker costs 1c. How much do they cost together?
6c (5 + 1)