1
Review: numbers, adding and money
Learner’s Book 1: Units 9–13, pp. 118–202
GoalUse counting, adding, taking away and coins to solve problems with numbers to 20.
New words
count on · start at the bigger number and count upcount back · start at the number and count downtotal · how many or how much altogether
Explanation
Numbers help us count, compare and work things out. We can count objects to 20, and a ten frame shows 10 and some more. To add, start at the bigger number and count on. To take away, start at the number and count back. A number line can help you with jumps. For money, add the coins one by one, and write the total with c for cents. Always check that your answer makes sense.
Worked examples
Add by counting on: 8 and 5 more. Start at 8 and jump 5: 9, 10, 11, 12, 13. So 8 + 5 = 13.
Take away by crossing out: 12 birds and 4 fly away. Cross out 4 and count what is left: 8 birds. So 12 − 4 = 8.
Add coins: 10c and 5c and 2c. Start with the biggest: 10, then 15, then 17. The total is 17c.
Class activity
Shop game: set out 6 small things with price labels from 1c to 10c. A friend buys 2 things. You add the prices to say the total, using real coins or buttons. Then give change from 20c.
Practice
1
Which is bigger, 17 or 12? How many more?
17 is bigger, by 5 more
2
What is 9 + 6?
15
3
What is 15 − 7?
8
4
What is the total?
18c (10 and 5 make 15, then 2 and 1 more make 18)