1. Year 2 Autumn Term Week 4 Lesson 4
Addition and
Subtraction
of Money
Year 2 Autumn Term Week 4 Lesson 4

2. Today we will be learning to:
make decisions if to use a + or –
use inverse operations
add a one-digit number to a teens number
subtract a one-digit number from a twenties number
add and subtract.

3. Inverse means opposite.
Excuse me, but what does inverse mean?
Inverse means opposite.

4. What strategies could we use for subtracting?
Mental Activity
What strategies could we use for subtracting?
Counting on from the smaller to the larger number on a number line.
Counting back from the larger number to the smaller number on a number line.
What other ways can we use?

5. How could we check our subtraction answers?
We could use a method called an ‘Inverse Operation’.
As the wise owl explained, the word ‘Inverse’ simply means opposite.

6. How could we check our subtraction answers?
If we look at the subtraction 7 – 2 =?

7. How could we check our subtraction answers?
If we look at the subtraction 7 – 2 =?
7 – 2 = 5

8. How could we check our subtraction answers?
7 – 2 = 5
so 5 + ? = 7
so = 7
This is called an ‘Inverse Operation’.

9. Today we are going to find ways of checking change.
Main Activity
Today we are going to find ways of checking change.

10. Pick one of the cards on the next screen .
Work out the sequence of the other cards to make a complete circuit.
The answer at the top of each problem is in large print at the top of another card.

11. Task
10p
buy crisps 4p 6p
find
10p 8p
win 2p
16p
spend 8p

12. Task
10p
buy crisps 4p 6p
find
10p
10p – 4p = ? 8p
win 2p
16p
spend 8p

13. Task 10p buy crisps 4p 6p find 10p 10p – 4p = 6p 8p win 2p 16p spend

14. Task 10p buy crisps 4p 6p find 10p 10p – 4p = 6p 8p win 2p 16p spend

15. Task
10p
buy crisps 4p 6p
find
10p
6p + 10p = ? 8p
win 2p
16p
spend 8p

16. Task 10p buy crisps 4p 6p find 10p 6p + 10p = 16p 8p win 2p 16p spend

17. Task
10p
buy crisps 4p 6p
find
10p 8p
win 2p
16p
spend 8p
16p – 8p = ?

18. Task 10p buy crisps 4p 6p find 10p 8p win 2p 16p spend 8p 16p – 8p =

19. Task
10p
buy crisps 4p 6p
find
10p
8p + 2p = ? 8p
win 2p
16p
spend 8p

20. Task 10p buy crisps 4p 6p find 10p 8p + 2p = 10p 8p win 2p 16p spend

21. Task 10p buy crisps 4p 6p find 10p 8p + 2p = 10p 8p win 2p 16p spend

22. Loop!
10p
buy crisps 4p 6p
find
10p 8p
win 2p
16p
spend 8p

23. Group Work Working in pairs, make circuit with ‘Money cards’.
Make circuit with ‘Money cards’. Make own circuit problem cards for someone else to solve.
Make circuit with ‘Money cards’.
Working in pairs, make circuit with ‘Money cards’.