1. Interpreting Pie Charts

2. Starter Find out the following fractions of amounts.
 Divide the amount by the denominator (bottom), then multiply by the numerator (top)
a) 1/5 of 20 b) 1/3 of 24
c) 3/4 of 8 d) 3/7 of 14
e) 7/10 of 90 f) 5/6 of 42
= 4
= 8
= 6
= 6
= 63
= 35

3. Interpreting Pie Charts
We are going to see how to answer questions involving Pie Charts
This will involve fractions, as well as the work we have done on finding a fraction of an amount

4. Interpreting Pie Charts
Favourite Colour
The Pie Chart shows people’s favourite colour from a choice of 4.
What fraction of people preferred red?
3 out of 8 sections 
What fraction of people preferred green?
2 out of 8 sections 
3 8
2 8
1 4

5. Interpreting Pie Charts
Favourite Colour
The Pie Chart shows people’s favourite colour from a choice of 4.
In total, 32 people were asked. How many people preferred yellow?
Favourite Colour
The Pie Chart shows people’s favourite colour from a choice of 4.
In total, 32 people were asked. How many people preferred yellow?
Favourite Colour
The Pie Chart shows people’s favourite colour from a choice of 4.
In total, 32 people were asked. How many people preferred yellow?
1 8
of 32
32 ÷ 8 = 4
So 4 people said yellow was their favourite…

6. Interpreting Pie Charts
Favourite Colour
The Pie Chart shows people’s favourite colour from a choice of 4.
In total, 16 people preferred green. How many people preferred red?
The green area has 2 sections
So each section will be worth 8
Red must be 24 as it has 3 sections (8 x 3)

7. Interpreting Pie Charts
Other
Favourite Colour
The Pie Chart shows what pets people have…
What fraction of people have a dog?
5 out of 12 sections 
What fraction of people have a cat?
4 out of 12 sections 
Dog
5 12 ÷4
Cat
Fish
4 12
1 3 ÷4

8. Interpreting Pie Charts
Other
Favourite Colour
The Pie Chart shows what pets people have…
48 people were asked in the survey. How many have a dog?
Dog
5 12
of 48
48 ÷ 12 = 4
Cat
Fish
4 x 5 = 20
So 20 people said they have a dog…

9. Interpreting Pie Charts
Other
Favourite Colour
The Pie Chart shows what pets people have…
20 people have a cat. How many people have a dog?
Cat has 4 sections, and was 20 people
 One section must be 5
 Dog has 5 sections so must represent 25 people (5 x 5)
Dog
Cat
Fish

10. Plenary

11. Plenary 1/3 were Perch  10 Perch 1/2 were Roach  15 Roach 5
So the remaining 5 fish were Pikes and Eels 5

12. Summary We have looked at using fraction in Pie Charts
We have seen how to find out how many people a certain area represents
We also looked at using the size of an area to work out how to find another area