🔵Reading Time, a.m./p.m. & 24-Hour Clock
A day has 24 hours. We split it into a.m. (midnight to noon) and p.m. (noon to midnight).
The 24-hour clock counts straight through: 1 p.m. is 13:00, 2 p.m. is 14:00, and so on (add 12 to afternoon/evening times).
On a normal clock, the short hand shows the hour and the long hand the minutes (each number = 5 minutes).
👀 See a worked example
Write 3 p.m. in 24-hour time.
3 + 12 = 15:00.
How many minutes are there in 1 hour?
60 minutes.
🤖 Vidi's Key Points
- A day has 24 hours; a.m. is morning, p.m. is afternoon/evening.
- 24-hour clock: add 12 to p.m. times (2 p.m. = 14:00).
- 1 hour = 60 minutes; each clock number = 5 minutes.
🟢Elapsed Time & the Calendar
Elapsed time is how long something lasts — count forward from the start to the end.
Calendar facts: 7 days in a week, 12 months in a year, 365 days in a year (366 in a leap year). 1 hour = 60 min; 1 minute = 60 seconds.
👀 See a worked example
A class starts at 9:00 and ends at 11:30. How long is it?
9:00 → 11:00 is 2 hours, + 30 min = 2 hours 30 minutes.
How many days are there in 3 weeks?
3 × 7 = 21 days.
🤖 Vidi's Key Points
- Elapsed time = count forward from start to end.
- 7 days/week, 12 months/year, 365 days/year.
- 1 hour = 60 minutes; 1 minute = 60 seconds.
🎯 Mission Test
Ready, Maths Hero? Take the chapter test to show what you've learned!
Start the Chapter Test →