Free Grade 3 Introducing Sampling Techniques in Examinations Flashcards
Free Grade 3 flashcards for Introducing Sampling Techniques in Examinations: 12 real questions with a full answer key and worked solutions. Charts show data visually. In a pie chart, each category's angle is its fraction of the total multiplied by 360°.
Free
Foundation
35 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain introducing sampling techniques in examinations
Explain introducing sampling techniques in examinations accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing sampling techniques in examinations
Calculate introducing sampling techniques in examinations accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing sampling techniques in examinations
Compare introducing sampling techniques in examinations accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify introducing sampling techniques in examinations
Justify introducing sampling techniques in examinations accurately in a familiar context.
Assessed by: Exit ticket of four short items
Prerequisites
Close these gaps first — each has its own free lesson, worksheet and quiz.
How Introducing Sampling Techniques in Examinations works
Charts show data visually. In a pie chart, each category's angle is its fraction of the total multiplied by 360°.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.In a survey: Red 6, Blue 15, Green 15, Yellow 15. In a pie chart, what angle does Red get?[1]
- 2.In a survey: Red 14, Blue 9, Green 12, Yellow 8. In a pie chart, what angle does Red get?[1]
- 3.In a survey: Red 7, Blue 3, Green 9, Yellow 10. In a pie chart, what angle does Red get?[1]
- 4.In a survey: Red 15, Blue 4, Green 6, Yellow 2. In a pie chart, what angle does Green get?[1]
- 5.In a survey: Red 14, Blue 8, Green 8, Yellow 4. In a pie chart, what angle does Green get?[2]
- 6.In a survey: Red 7, Blue 9, Green 10, Yellow 11. In a pie chart, what angle does Blue get?[2]
- 7.In a survey: Red 4, Blue 8, Green 15, Yellow 8. In a pie chart, what angle does Green get?[2]
- 8.In a survey: Red 14, Blue 12, Green 11, Yellow 7. In a pie chart, what angle does Blue get?[2]
- 9.In a survey: Red 2, Blue 9, Green 12, Yellow 7. In a pie chart, what angle does Red get?[3]
- 10.In a survey: Red 4, Blue 10, Green 12, Yellow 13. In a pie chart, what angle does Yellow get?[3]
- 11.In a survey: Red 2, Blue 7, Green 13, Yellow 13. In a pie chart, what angle does Yellow get?[3]
- 12.In a survey: Red 13, Blue 15, Green 14, Yellow 9. In a pie chart, what angle does Yellow get?[3]
Show answers and working
1. 42.4°
Total = 51. Red fraction = 6/51. 6/51 × 360° = 42.4°.
2. 117.2°
Total = 43. Red fraction = 14/43. 14/43 × 360° = 117.2°.
3. 86.9°
Total = 29. Red fraction = 7/29. 7/29 × 360° = 86.9°.
4. 80°
Total = 27. Green fraction = 6/27. 6/27 × 360° = 80°.
5. 84.7°
Total = 34. Green fraction = 8/34. 8/34 × 360° = 84.7°.
6. 87.6°
Total = 37. Blue fraction = 9/37. 9/37 × 360° = 87.6°.
7. 154.3°
Total = 35. Green fraction = 15/35. 15/35 × 360° = 154.3°.
8. 98.2°
Total = 44. Blue fraction = 12/44. 12/44 × 360° = 98.2°.
9. 24°
Total = 30. Red fraction = 2/30. 2/30 × 360° = 24°.
10. 120°
Total = 39. Yellow fraction = 13/39. 13/39 × 360° = 120°.
11. 133.7°
Total = 35. Yellow fraction = 13/35. 13/35 × 360° = 133.7°.
12. 63.5°
Total = 51. Yellow fraction = 9/51. 9/51 × 360° = 63.5°.
Worked examples
In a survey: Red 15, Blue 10, Green 9, Yellow 10. In a pie chart, what angle does Green get?
- Total = 44.
- Green fraction = 9/44.
- 9/44 × 360° = 73.6°.
- Answer: 73.6°
In a survey: Red 9, Blue 5, Green 11, Yellow 12. In a pie chart, what angle does Blue get?
- Total = 37.
- Blue fraction = 5/37.
- 5/37 × 360° = 48.6°.
- Answer: 48.6°
In a survey: Red 11, Blue 2, Green 11, Yellow 6. In a pie chart, what angle does Yellow get?
- Total = 30.
- Yellow fraction = 6/30.
- 6/30 × 360° = 72°.
- Answer: 72°
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Uses 100 instead of 360 for pie-chart angles.
Correction: A full circle is 360°.
Forgets to find the total first.
Correction: Add all frequencies before working out fractions.
Teacher tips
- · Have pupils check that all angles add to 360°.
Parent tips
- · Look at charts in the news and ask what they show.
Real-life applications
- · News infographics, survey results.
Assessment objectives
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Frequently asked
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- What should a learner already know before this?
- Start with Working with Introducing Sampling Techniques, Rules and Methods in Introducing Sampling Techniques, Introducing Sampling Essentials. Each one has its own free lesson, worksheet and quiz.
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- Move on to Introducing Sampling Essentials, Introducing Sampling Word Problems, Introducing Sampling Common Errors, which build directly on this idea.
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