The 24-hour clock and time taken — Maths worksheet

The method

Add 12 after noon — “for p.m. times add 12 to the hour; to go back, take 12 away”

1. a.m. → keep the hour, written with 2 digits: 07:15.
2. p.m. → add 12 to the hour: 3:35 p.m. = 15:35.
3. 24-hour back to 12-hour: hour more than 12 → take away 12 and say p.m.
4. Time taken: count whole hours, then minutes. 1 hour = 60 minutes.

Use it for: Reading train tickets and timetables, planning a day out, and the time chapter of Class 4 maths.

Worked example: A train leaves at 09:15 and reaches at 11:40. How long is the journey (in minutes)? → 145

✏️ Practice

Work it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.

🏁 Lesson 30 test

20 sums. Check each answer, then go to the next one. Get 16 or more right to pass.

🏅 Sign in with Google to earn the 🚆 Railway Timekeeper badge when you pass — and a certificate when you finish all 8 lessons of Part 4 · Class 4. You can still take the test without signing in.

🖨️ Class 4 Maths Worksheet: 24-Hour Clock

• Worksheet set 1 (PDF)
• Worksheet set 2 (PDF)
• Worksheet set 3 (PDF)