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Everyday maths 2 (Wales)

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# 4.1 Drawing pie charts

The best way to understand the steps involved in drawing a pie chart is to watch the worked example in the video below.

Interactive feature not available in single page view (see it in standard view).

Now have a go at drawing a pie chart for yourself.

## Activity 7: Drawing a pie chart

1. A leisure centre wants to compare which activities customers choose to do when they visit the centre. The information is shown in the table below. Draw an accurate pie chart to show this information. You may hand-draw your pie chart or create it using a computer package.

Table 8(a)
ActivityNumber of customers
Swimming26
Gym17
Exercise class 20
Sauna9

1. Firstly, work out the total number of customers:

• 26 + 17 + 20 + 9 = 72

Now work out the number of degrees that represents customer:

• 360˚ ÷ 72 = 5˚ per customer

Table 8(b)
ActivityNumber of customersNumber of degrees
Swimming2626 × 5 = 130˚
Gym1717 × 5 = 85˚
Exercise class 2020 × 5 = 100˚
Sauna99 × 5 = 45˚

Now use this information to draw your pie chart. It should look something like this:

Figure 13 Pie chart for customer leisure centre activities
1. The table below shows the sandwich sales over one year for sandwich company, Belinda’s Butties. Draw a pie chart to illustrate the data. You may hand-draw your pie chart or create it using a computer package.
Table 9(a)
Sandwich TypeSales (000s)
Cheese and onion20
Egg and cress17
Prawn11
Coronation chicken12
Tuna mayonnaise9
Ham8
Beef and tomato13

1. Firstly, work out the total number of sandwich sales:

• 20 + 17 + 11 + 12 + 9 + 8 + 13 = 90 (000s)

Now work out the number of degrees that represents each sale:

• 360 ÷ 90 = 4˚ per sale

Table 9(b)
Sandwich TypeSales (000s)Number of Degrees
Cheese and onion2020 × 4 = 80°
Egg and cress1717 × 4 = 68°
Prawn1111 × 4 = 44°
Coronation chicken1212 × 4 = 48°
Tuna mayonnaise99 × 4 = 36°
Ham88 × 4 = 32°
Beef and tomato1313 × 4 = 52°
• Now use this information to draw your pie chart. It should look something like the one below.

Figure 14 Belindas Butties – sales over one year (000s)

Now that you can accurately draw a pie chart, it’s time to look at how to interpret them. You won’t always be given the actual data, you may just be given the total number represented by the chart or a section of the chart and the angles on the pie chart itself. It’s useful to know how to use your maths skills to work out the actual figures.

Here’s a reminder of the degrees of a circle which will be useful when you come to read from pie charts.

Figure 15 Degrees of a circle