Maths Quiz - Level 5-6 Data Handling - Pie Charts (Answers)
In KS3 Maths, you'll dive into data handling, and that involves showing information with graphs, tables, or charts. This quiz zooms in on one of these – the pie chart.
A pie chart is like a visual guide to see how data is spread across categories. Each category gets a 'slice' of the pie, and the bigger the 'slice', the more important that category is.
Click to See How Quizzes Help Learning[readmore]
Imagine 100 people naming their favourite film genre. If 50 say comedy and only 5 say romance, the comedy slice is like half the pie, and romance is just one-tenth. Now, the tricky part is turning these fractions into degrees.
Remember, a whole circle has 360o, so 1% is 3.6o. In our example, comedy takes 180o, and romance is 36o. Simple once you get the hang of it! Give this quiz a go to see how well you get pie charts.
[/readmore]
|
|
||||||||||||||||||||||||
|
|
||||||||||||||||||||||||
|
|
||||||||||||||||||||||||
|
|
||||||||||||||||||||||||
|
|
You can find more about this topic by visiting BBC Bitesize - Representing data
A sector is a portion of a circle enclosed by two radii and an arc
|
The larger the angle, the more important the category
|
||||||||||||||||||||||||
Just as in all circles
|
10% is 1/10. One tenth of the pie chart is 360 / 10 = 36
|
||||||||||||||||||||||||
80 / 400 = 1/5
|
150 / 400 = 3/8. To find 3/8 of 360° divide by 8 then multiply by 3. (360 / 8) x 3 = 45 x 3
|
||||||||||||||||||||||||
45° is 1/8 of the pie chart so represents 1/8 of the 1,000 boys. 1000 / 8 = 125
|
It's helpful to remember some common percentages and their fraction equivalents, e.g. 1/8 = 121⁄2%
|
||||||||||||||||||||||||
Half of 1,000 is 500. You cannot say how much more than 500 unless you know the size of the pie chart angle
|
10 is 1% of the total. To find 1% you divide by 100. 360 / 100 = 3.6
|