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Published byTimothy Walsh Modified over 6 years ago

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pie chartspie 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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1/4 How many have black hair? There are 40 children in the class.

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1/4 What is ¼ of 40? Children with black hair are ¼ of the total (40) There are 40 children in the class.

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1/4 10 children with black hair There are 40 children in the class.

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10 There are 40 children in the class.

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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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25% How many have black hair? There are 40 children in the class.

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25% What is the fraction? Children with black hair are 25% of the total (40) There are 40 children in the class. 25% = 1/4

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25% ¼ of 40 = ? Children with black hair are 25% of the total (40) There are 40 children in the class.

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1/4 10 children with black hair There are 40 children in the class.

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10 There are 40 children in the class.

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Boys Girls 60 children in total 60% 40% How many children in total?

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Boys Girls 60 children in total 60% 40% How many are boys?

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Boys Girls 60 children in total 60% 40% What is the fraction?

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Boys Girls 60 children in total 60% 40% 40% = 40/100 = 4/10

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Boys Girls 60 children in total 60% 40% 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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180 ° 90° 60 children in a class ?

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180 ° 90° 60 children in a class ? What is the fraction?

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180 ° 90° 60 children in a class ? 180°/360° What is the fraction?

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180 ° 90° 60 children in a class ? 180°/360° = 18/36 = 1/2

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180 ° 90° 60 children in a class

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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: 180° 60° 90° = 180/360 = 1/2 = 60/360 = 1/6 = 90/360 = 1/4 120° = 120/360 = 1/3

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180° 360 ° = 40 children

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180° 360° 360 ° = 40 children

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180 360 360 ° = 40 children 1212 =

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180 360 360 ° = 40 children 1212 =

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180 ° 360 ° = 40 children ½ of the total (40) = 20 children

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

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