Pie Chart Detective
Learn with Alicia · Primary 7 · UNEB-style practice
Pie Chart Detective
Connect frequencies, fractions, percentages and angles to investigate what a pie chart really says.
FootballReadingMusicGardeningDebate
THE EVIDENCE
The school activity survey
A school surveyed 120 pupils about their favourite activity. The detective must verify every sector.
| Activity | Pupils |
|---|---|
| Football | 48 |
| Reading | 24 |
| Music | 18 |
| Gardening | 12 |
| Debate | 18 |
Category ÷ total.
Compare the category frequency with all 120 pupils.
Fraction × 360°.
A complete circle is 360°, so every sector is part of 360°.
Angles total 360°.
Frequencies must total 120 and percentages must total 100%.
15-QUESTION PRACTICE
Solve the survey case.
Solved: 0 / 15
WARM-UP · Read the whole chart
1. How many degrees are in a complete pie chart?
2. How many pupils were surveyed?
3. What angle represents Football?
4. What fraction of the pupils chose Reading?
5. What percentage chose Music?
GUIDED APPLICATION · Compare sectors
6. What angle represents Gardening?
7. Which two activities have equal sectors?
8. How many more pupils chose Football than Reading?
9. What percentage chose Music or Debate?
10. How many degrees represent one pupil?
REASONING CHALLENGE · Reconstruct missing information
11. A new sector measures 90°. How many of the 120 pupils would it represent?
12. Four sectors measure 144°, 72°, 54° and 36°. What is the missing sector?
13. If 200 pupils gave the same pattern of answers, how many would choose Football?
14. A learner draws the Reading sector as 60°. By how many degrees is it too small?
15. In a survey of 120 pupils, a sector measures 126°. How many pupils does it represent?
Coach reflection
For every sector, keep four facts connected: frequency, fraction, percentage and angle. If one changes, use the total to rebuild the others.