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P4 Maths: 24-Hour Time Calculations (Paper 4 (error clinic))
Tutor Prep Guide · am/pm and 24-hour conversion; durations across noon and midnight; minute carrying; everyday timetables
P4 Maths: 24-Hour Time Calculations (Paper 4 (error clinic))
Paper 4 (error clinic): ten time questions on am/pm and 24-hour conversion, durations across noon and midnight, and minute carrying, with answers and one-line notes.
Direct answers Level: P4 maths; format: am/pm and 24-hour conversion, durations, spans across midnight, and minute carrying or borrowing.
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: P4 Maths: 24-Hour Time Calculations |
| Level | P4 |
02 Questions (10 items)
- FoundationWhat is 2:00 pm in 24-hour time?
- FoundationWhat is 18:00 in 12-hour time?
- FoundationHow long is it from 10:30 to 12:00?
- IntermediateWhat time is 30 minutes after 06:45?
- IntermediateHow many minutes are in 3 hours?
- IntermediateHow long is it from 22:15 to 23:00?
- ChallengeHow long is it from 11:40 am to 1:10 pm?
- ChallengeHow is 13:05 written in 12-hour time?
- ChallengeWhat time is 2 hours 55 minutes after 08:20?
- Error redoA pupil writes 9:15 pm as 09:15. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 14:00. | 2 + 12 = 14, so the time is 14:00. |
| 2 | 6:00 pm. | 18 – 12 = 6, so it is 6:00 pm. |
| 3 | 1 hours 30 minutes. | From 10:30 to 12:00 is 1 hour 30 minutes. |
| 4 | 07:15. | 45 + 30 = 75 minutes, which is 1 hour 15 minutes, so the time is 07:15. |
| 5 | 180 minutes. | There are 60 minutes in an hour, and 3 x 60 = 180 minutes. |
| 6 | 45 minutes. | From 22:15 to 23:00 is 45 minutes. |
| 7 | 1 hours 30 minutes. | From 11:40 to 13:10 is 1 hour 30 minutes. |
| 8 | 1:05 pm. | Subtract 12 from 13 to get 1, so it is 1:05 pm. |
| 9 | 11:15. | 08:20 plus 2 hours is 10:20, and adding 55 minutes gives 11:15. |
| 10 | It should be 21:15. | 09:15 is in the morning; an evening hour needs 12 added, so 21:15 is correct. |
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.
Check the answers; for a wrong duration, write both times down and subtract them in steps.Tutor Registration →
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