1. To understand and use the correct order of operations
Fish Shop Maths
To understand and use the correct order of operations

2. A man walks into a Chip shop …
Rita owns a fish & chip shop.
Write down the exact portions of food each customer orders
Eg 3 fish, 4 chips, 1 sausage

3. Three fish and four chips, ta!
John
Three fish and four chips, ta!

4. Sausage and chips twice, please!
Freddie
Sausage and chips twice, please!

5. Five fish and chips. Thanks!
Brian
Five fish and chips. Thanks!

6. So what did Rita have to serve up?
John
Three fish and four chips, ta!
3 fish
4 portions of chips

7. So what did Rita have to serve up?
Freddie
Sausage and chips twice, please!
2 sausages
2 portions of chips
1 sausage
2 portions of chips

8. So what did Rita have to serve up?
Brian
Five fish and chips. Thanks
5 fish
1 portion of chips
5 fish
5 portions of chips

9. Confused? Why were there two possible answers to some of the orders?
In a maths lesson, can there ever be two possible answers to a simple calculation?

10. Try this: 2 × 3 + 5 1 + 3 × 5 Compare your answers with a partner

11. The solution
All mathematicians in the world have agreed a set order to work out these calculations:
Brackets
Indices (Powers)
Multiply
Divide
Add
Subtract

12. Remember: No swapping where the numbers go
Example
What is 5 × (6 + 4) ÷ 2?
What do we need to use?
5 × (6 + 4) ÷ 2
5 × 10 ÷ 2
5 × 5 25
Did you do 50 ÷ 2?
Did you get the same answer?
Brackets
Indices (Powers)
Multiply
Divide
Add
Subtract
Remember: No swapping where the numbers go

13. Questions 5 × (2 + 1) 5 × 2 + 1 12 + 4 ÷ 2 (12 + 4) ÷ 2 3 × 10 ÷ 5
10 ÷ 5 × 3
3 × 6 ÷ 2 - 1
3 × 6 ÷ (2 - 1)

14. Answers (Click to reveal)
5 × (2 + 1)
5 × 2 + 1
15 – 4 × 3
÷ 2
(12 + 4) ÷ 2
3 × 10 ÷ 5
10 ÷ 5 × 3
3 × 6 ÷ 2 - 1
3 × 6 ÷ (2 - 1) 15 11 3 14 8 6 18