Pie charts and double bar graphs

Pie charts with percentages and angles, and reading double bar graphs. Read one part at a time and tap “I know this”. Then test yourself in the quiz.

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Pie charts

30 learners’ favourite sport

A pie chart shows each part as a slice of the circle. The whole circle = all the data = 100% = 360°.

Rule

Angle of a slice = (part ÷ total) × 360°. Percentage = (part ÷ total) × 100%. Soccer: ¹²⁄₃₀ × 360° = 144°, and ¹²⁄₃₀ × 100% = 40%.

Sport	Learners	Fraction	Percentage	Angle
soccer	12	⅖	40%	144°
netball	9	³⁄₁₀	30%	108°
rugby	6	⅕	20%	72°
cricket	3	⅒	10%	36°
total	30	1	100%	360°

Tap when you could tell someone without looking.

A double bar graph has two bars side by side for each category, e.g. boys and girls. The key says which colour is which group.
First compare the two bars in each category, then the categories with each other.
Example: soccer: boys 14, girls 8, so 6 more boys. Netball: boys 2, girls 11, so 9 more girls.

Meerkat tip

Always check the key and the scale before you read a bar.

Tap when you could tell someone without looking.

Remember this: your summary

Write these points in your book. Read them again the night before the test.

Memory trick

Divide by the total, multiply by 360.

Flash cards · Tap to turn over

First say the answer yourself, then turn the card over.

Now the real quiz!

The quiz has many more questions on this topic. Every question shows straight away whether you are right and explains why.

For parents

Let your child work the examples on paper and explain them to you.
The ticks (“I know this”) are saved on this device only. We never ask for names or emails.

Follows CAPS for Grade 7 Mathematics. Always check your teacher’s notes and textbook too.