Limits of accuracy Notes and examples: past paper questions
Real questions on limits of accuracy notes and examples
The newest 7 of 7 written questions. Open one to see it on the real paper.
- 4024/21 · October/November 2025 · Q19[3]
3-mark “Calculate” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 4024/12 · May/June 2024 · Q19b[2]
2-mark “Calculate” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 4024/21 · May/June 2024 · Q5b[2]
2-mark “Find” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 4024/22 · October/November 2022 · Q5c[3]
3-mark “Calculate” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 4024/12 · May/June 2020 · Q5[2]
2-mark question — its maths and diagrams are best seen on the paper.
See it on the paper → - 4024/11 · October/November 2019 · Q14c[1]
1-mark “Find” question — its maths and diagrams are best seen on the paper.
See it on the paper → - 4024/12 · October/November 2019 · Q6b[1]
1-mark “Write” question — its maths and diagrams are best seen on the paper.
See it on the paper →
What examiners said
Candidates found this bounds question challenging. The most common incorrect answer was 33, usually obtained when candidates found the correct upper bound for the diameter of both the coins. There were some candidates who recognised the need to use the upper bound for the five-cent coin and the lower bound for the ten-cent coin, but they did not use the fact that the lines had 10 of each coin, pro...
— Examiner report, October/November 2022, 4024/22 Q5(c) (Cambridge)
This part was found to be the most challenging with a minority giving 6 as the correct answer. Some found this efficiently by inspecting the indices and deducing the extra factors needed. Others chose a longer route by evaluating p = 600, choosing 3600 as the next multiple of p that is a square number and deriving 6 from this. Many did not know how to approach this question and gave no response, a...
— Examiner report, October/November 2019, 4024/11 Q14(c) (Cambridge)
Candidates found this question challenging. Those who understood the concept of upper bounds did not always read the question carefully and assumed that the value was rounded to the nearest centimetre rather than the nearest 5 cm so gave the answer 95.5. Another common incorrect answer was 100, resulting from adding on 5 cm rather than 2.5 cm.
— Examiner report, October/November 2019, 4024/12 Q6(b) (Cambridge)
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