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P2 Maths Time Paper 4: Error Review
P2 Maths Time Paper 4: Error Review
Ten original error-review items: each shows a wrong pupil answer to correct and explain.
Direct answers All ten items are error review: 1-3 fix reading dial numbers as minutes, the minutes in an hour and the value of a big mark, 4-6 fix failing to carry at 60 minutes, over-counting elapsed time and mixing units, 7-9 fix treating time as a decimal, an uncarried finishing time and a long span across noon, and item 10 carries both hours and minutes and states the slip.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: P2 Maths: Time in Hours and Minutes |
| Level | P2 |
02 Questions (10 items)
- FoundationA pupil reads a clock: hour hand on 3, minute hand on 4, and answers “3:04”. What is the correct time?
- FoundationA pupil writes “1 hour = 100 minutes”. How many minutes are in an hour?
- FoundationA pupil says one big mark on the dial is 1 minute. How many minutes is one big mark?
- IntermediateStarting at 9:50, a pupil adds 20 minutes and answers “9:70”. What is the correct time?
- IntermediateA pupil says the time from 10:15 to 11:05 is 1 hour 10 minutes. How long is it really?
- IntermediateA pupil adds 45 minutes and 30 minutes and answers “7 hours 5 minutes”. What is correct?
- ChallengeA pupil writes “2 hours 40 minutes” as 240 minutes. How many minutes is it?
- ChallengeA lesson starts at 8:35 and lasts 40 minutes; a pupil answers “8:75”. When does it end?
- ChallengeA pupil says 11:40 to 13:10 is 2 hours 30 minutes. How long is it really?
- Error redoA pupil adds 1 hour 30 minutes to 10:45 and answers “11:75”. What went wrong and what is the correct time?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 3:20 | Each number on the dial stands for five minutes, so the minute hand on 4 means 20 minutes and the time is 3:20. |
| 2 | 60 minutes | Hours and minutes use base sixty, so one hour is 60 minutes, not 100. |
| 3 | 5 minutes | Twelve big marks make 60 minutes, so one big mark is 5 minutes. |
| 4 | 10:10 | Fifty plus twenty makes seventy minutes; carrying sixty into an hour gives 10:10. |
| 5 | 50 minutes | It is 45 minutes from 10:15 to 11:00 and 5 more minutes, so 50 minutes in all. |
| 6 | 1 hour 15 minutes | 45 plus 30 makes 75 minutes, which is 1 hour 15 minutes. |
| 7 | 160 minutes | Two hours is 120 minutes and 40 more gives 160 minutes; time is not written in decimals. |
| 8 | 9:15 | 35 plus 40 makes 75 minutes, that is 1 hour 15 minutes, so the lesson ends at 9:15. |
| 9 | 1 hour 30 minutes | It is 20 minutes to 12:00 and 1 hour 10 minutes more, so 90 minutes, that is 1 hour 30 minutes. |
| 10 | 12:15 | The pupil left 75 minutes uncarried; 75 minutes is 1 hour 15 minutes, so 10:45 plus 1 hour 30 minutes is 12:15. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
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