Pie ChartsPie Charts

Primary 6 Mathematics

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Pie ChartsPie Charts

Chapter Learning OutcomesChapter Learning Outcomes

Read and interpret pie charts

Solve 1-step problems using information given in pie charts

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Pie ChartsPie Charts

Understanding Pie ChartsUnderstanding Pie Charts

Numerical data can be represented using different charts.

We can also use pie charts to represent these data.

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Pie ChartsPie Charts

Understanding Pie ChartsUnderstanding Pie Charts A pie chart is a circle graph where the

whole is always 100% or 1 whole.

The values on the pie chart can be in whole numbers or in fractional or percentage form.

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Pie ChartsPie Charts

Reading Pie ChartsReading Pie Charts The pie chart shows the favourite subject of

a group of pupils. We can tell that:

18 pupils like Mathematics. 16 pupils like English. 12 pupils like Science. 6 pupils like Mother Tongue.

Therefore, there are (18 + 16 + 12 + 6) = 52 pupils altogether.

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Pie ChartsPie Charts

Reading Pie ChartsReading Pie Charts The pie chart shows the breakdown of 3520

visitors to the zoo last Sunday. We can tell that:

There were equal number of boys and women.

There were (3520 4) = 880 boys and 880 women.

There were (3520 880 880 940) = 820 men.

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Pie ChartsPie Charts

ExampleExample The pie chart shows the result of a survey of the

colour of 200 cars at an intersection. The number of red cars and blue cars were the same.(a) How many white cars were there?

200 4 = 50There were 50 white cars.

(b) How many red cars were there?(200 64 32 50) 2 = 27There were 27 red cars.

(c) Which colour was most popular? Black

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Pie ChartsPie Charts

ExampleExample The pie chart shows the first 120 dishes sold at a

hawker stall. Half of the dishes sold were fish soup and fried rice.

(a) How many dishes of fried noodles were sold?

120 4 = 30; 30 dishes of fried noodles were sold.

(b) Which dish was most popular? How many dishes were sold?

Fish soup was most popular. There were (120 2) (20% 120) = 36 dishes sold.

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Pie ChartsPie Charts

Reference - Reference - TextbooksTextbooks

Learning Outcomes

Read & interpret pie charts 6B p.63–64 6A p.26–27

Solve 1-step problem using information given in pie charts

6B p.64–66 6A p.28–33