The document focuses on dual and compound bar charts, outlining objectives such as drawing frequency diagrams and interpreting data. It includes examples of bar charts showing pet ownership among Year 6 students, alongside questions about student performance and data comparisons. Key instructions are provided on best practices for creating bar charts, like including titles and ensuring consistent bar width.

1. 8.2
DUAL AND
COMPOUND
BAR CHARTS
Objectives
• Draw frequency diagrams dual and compound
bar charts and interpret data

2. ncetm.org.uk
Individual warm up (3 min)
Find missing
numbers on
the scales ?
How much
red is greater
than blue
one?
How much
blue is
greater than
red in the
second
Chart ?

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Dual bar charts
Cat Dog Fish Rabbit Other
0
2
4
6
8
10
A Bar Chart to Show How
Many Pets Y6 Have
Number of Boys Number of Girls
Type of Pet
Number
of
Children
Cat Dog Fish Rabbit Other
0
2
4
6
8
10
12
14
16 A Bar Chart to Show
How Many Pets Y6 Have
Type of Pet
Number
of
Children
Pet Number of Children
Cat 12
Dog 14
Fish 7
Rabbit 5
Other 8
Pet
Number of
Boys
Number of
Girls
Cat 7 5
Dog 6 8
Fish 3 4
Rabbit 1 4
Other 2 6

4. ncetm.org.uk
Compound bar chart
Cat Dog Fish Rabbit Other
0
2
4
6
8
10
A Bar Chart to Show
How Many Pets Y6
Have
Number of Boys Number of Girls
Type of Pet
Number
of
Children
Pet Number of Boys
Number of
Girls
Cat 7 3
Dog 6 4
Fish 3 4
Rabbit 1 4
Other 2 6
Pet Number of Children
Cat 12
Dog 14
Fish 7
Rabbit 5
Other 8 Cat Dog Fish Rabbit Other
0
2
4
6
8
10
12
14
16
A Bar Chart to Show
How Many Pets Y6
Have
Type of Pet
Number
of
Children

5. a) What percentage of students in 8U received for effort?
b) Which tutor group received the highest percentage of their
marks for classwork?
c) Given 8D received a total of 200 marks, how many of these
were for classwork?
d) “More students in 8D received marks for home learning than in
8U”. Is this correct? Explain.
Percentage of each task in 8U ,8
%63
%87
%97
%68
%88
%99
%10 %11

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Difference between the 2 charts

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Open discussion

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Find the missing and focus on mistakes in this example
• A bar chart must always have a title explaining what it shows.
• Bars must be carefully drawn to show the data.
• There must be a gap between each bar.
• Each bar must be the same width.

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Individual Work *copybook *
student book ( p 89(

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Check your answers

11. Classwork
P. (90 89)
Q. ( 3 to (6
30/11/2024
Dual and Compound bar charts