pie%20charts

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pie charts
for erin
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Part 1 Pie charts with FRACTIONS
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To understand a pie chart, you need to find out 2
pieces of information
1) what is the total number?
E.g. 40 children in total
2) what are the fractions?
E.g. ¼ of each
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There are 40 children in the class.
1/4
How many children in total?
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There are 40 children in the class.
1/4
How many have black hair?
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There are 40 children in the class.
1/4
What is ¼ of 40?
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There are 40 children in the class.
1/4
10 children with black hair
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There are 40 children in the class.
10
10
10
10
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Now do the exercises in your Schofield Sims
Graphs, Charts and Data book Page 25
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Part 2 Pie charts with PERCENTAGES
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Treat PERCENTAGES the same way as fractions
To understand a pie chart, you need to find out 2
pieces of information
1) what is the total number?
E.g. 40 children in total
2) what are the fractions?
You need to convert the percentages to fractions!
The fraction will be /100.
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There are 40 children in the class.
25
How many children in total?
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There are 40 children in the class.
25
How many have black hair?
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There are 40 children in the class.
25
What is the fraction?
25 1/4
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There are 40 children in the class.
25
¼ of 40 ?
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There are 40 children in the class.
1/4
10 children with black hair
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There are 40 children in the class.
10
10
10
10
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60 children in total
Boys
40
Girls
60
How many children in total?
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60 children in total
Boys
40
Girls
60
How many are boys?
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60 children in total
Boys
40
Girls
60
What is the fraction?
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60 children in total
Boys
40
Girls
60
40 40/100 4/10
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60 children in total
Boys
40
Girls
60
4/10 of 60 ?
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Part 3 Pie charts with DEGREES
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Treat PERCENTAGES the same way as fractions
To understand a pie chart, you need to find out 2
pieces of information
1) what is the total number?
E.g. 40 children in total
2) what are the fractions?
You need to convert the degrees to fractions!
The fraction will be /360.
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60 children in a class
90
180
?
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60 children in a class
90
180
?
What is the fraction?
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60 children in a class
180/360
90
180
?
What is the fraction?
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60 children in a class
90
180
?
180/360 18/36 1/2
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60 children in a class
90
180
90
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As always, to understand such a pie chart, you
need to find out 2 pieces of information
1) what is the total number?
E.g. 40 children in total
2) what are the fractions ? create an equivalent
fraction!!
E.g. 90 90/360 1/4
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Examples
90/360 1/4
90
60/360 1/6
60
180/360 1/2
180
120/360 1/3
120
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360 40 children
180
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360 40 children
180 360
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360 40 children
180 360
1 2

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360 40 children
180 360
1 2

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360 40 children
180
½ of the total (40) 20 children
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360 40 children
¼ of the total (40) 10 children
90
180
90
½ of the total (40) 20 children