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P4 Maths: 24-Hour Time Calculations (Paper 2 (intermediate))
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 2 (intermediate))
Paper 2 (intermediate): 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 time is 40 minutes after 09:45?
- FoundationHow long is it from 13:20 to 15:05?
- FoundationHow long is it from 22:40 to 00:20 the next day?
- IntermediateHow long is it from 4:50 pm to 6:10 pm?
- IntermediateA bus leaves every 45 minutes from 08:00. When does the third bus leave?
- IntermediateWhat time is 15 minutes after 19:55?
- ChallengeHow many minutes are there in a day?
- ChallengeHow many minutes are in 2 hours 45 minutes?
- ChallengeHow long is it from 7:45 am to 1:15 pm?
- Error redoA pupil writes a time as 14:70. Why is that wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 10:25. | 45 + 40 = 85 minutes; 60 minutes make an hour, so the time becomes 10:25. |
| 2 | 1 hours 45 minutes. | Subtract 13:20 from 15:05, borrowing an hour as 60 minutes, to get 1 hour 45 minutes. |
| 3 | 1 hours 40 minutes. | From 22:40 to 24:00 is 80 minutes; add 20 minutes to reach 00:20, giving 1 hour 40 minutes. |
| 4 | 1 hours 20 minutes. | Both hours become 16:50 and 18:10; the difference is 80 minutes, or 1 hour 20 minutes. |
| 5 | 10:15. | 45 x 3 = 135 minutes, which is 2 hours 15 minutes, so add it to 08:00 to reach 10:15. |
| 6 | 20:10. | 55 + 15 = 70 minutes, which is 1 hour and 10 minutes, so the time is 20:10. |
| 7 | 1440 minutes. | A day has 24 hours, and 24 x 60 = 1440 minutes. |
| 8 | 165 minutes. | 2 x 60 = 120, then add 45 minutes, giving 165 minutes in all. |
| 9 | 5 hours 30 minutes. | From 7:45 to 13:15 is 5 hours 30 minutes; remember to add 12 after noon. |
| 10 | Minutes stop at 59; it should be 15:10. | 70 minutes carry over to 1 hour 10 minutes, so 14:70 means 15:10 and must not be written that way. |
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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