Grade 4, Measurement and geometry
24-hour time
Change between a.m. and p.m. times and the 24-hour clock.
Three levels
One skill, rising difficulty
Each sheet carries one level. The three are the same skill at rising difficulty, each named for what it practises.
- Level 1: Afternoon and evening to 24-hour
- Write each time on the 24-hour clock.
- Level 2: 24-hour to a.m. or p.m.
- Write the time on a 12-hour clock. Write a.m. or p.m.
- Level 3: Mixed, with midnight and noon
- Change each time to the other clock. On a 12-hour clock, write a.m. or p.m. On a 24-hour clock: Use two digits for the hour, like 06:55.
Worked example
How the sheet explains it
The helper printed at the top of each sheet: one solved example and the steps a student follows, before the first question. Every number sentence in it is proven by the same checker as the answer key.
Level 1: Afternoon and evening to 24-hour
3:45 p.m. = 15 : 45
- It is p.m. and the hour is not 12, so add 12 to the hour: 3 + 12 = 15.
- Keep the minutes. 3:45 p.m. is 15:45.
Level 2: 24-hour to a.m. or p.m.
20:10 = 8 : 10 p.m.
- Hours 13 to 23 are after noon: write p.m. Hours 01 to 11 are before noon: keep the hour and write a.m.
- 20 is after noon, so take 12 away from the hour: 20 − 12 = 8. So 20:10 is 8:10 p.m.
Level 3: Mixed, with midnight and noon
12:15 a.m. = 00 : 15
- 12:15 a.m. is 15 minutes after midnight, the very start of the day.
- Midnight is hour 00, so 12:15 a.m. is 00:15. Noon is different: 12:15 p.m. stays 12:15.
Goes with
Reference sheets
One-page helpers a student keeps beside this sheet:
- Time
Every reference, facts and support sheet is listed in the worksheet catalogue.
In the BC curriculum
Content standards
The British Columbia content standard this skill is written for, by the codes used across this site:
- bc.math.4.c.12
The wording of each standard is on the Province's mathematics curriculum page.
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