Class 4 Maths Chapter 12, Ticking Clocks and Turning Calendar, celebrates Parv’s leap-year birthday (29 February) to teach leap years, calendar intervals, reading hours and minutes, AM/PM notation, and the 24-hour digital railway/airport clock.
What Class 4 Mathematics Chapter 12 Covers
Turning Calendar — Leap Years & Counting Days compares February calendars in leap years (29 days, 366 days in the year, occurring every 4 years like 2016, 2020, 2024, 2028) versus ordinary years (28 days, 365 days), and calculates age and festival durations.
Ticking Clocks — AM/PM, 24-Hour Clock & Elapsed Time reads time to the exact minute, distinguishes AM (midnight 12:00 to noon 12:00) from PM (noon 12:00 to midnight 12:00), converts to 24-hour clock time (e.g., 1:00 PM = 13:00 hours, 8:00 PM = 20:00 hours), and finds time durations.
Exercises in Chapter 12
- Let Us Do, Let Us Try, and Let Us Solve textbook exercises.
- Hands-on straw/grid models, dot-paper drawing, and number games.
Read Class 4 Mathematics Chapter 12 Online
More Chapters
- Previous: Chapter 11: Fun with Symmetry
- Next: Chapter 13: The Transport Museum
- Hindi medium: Class 4 Maths Chapter 12 PDF in Hindi (Ganit Mela)
- All Mathematics chapters and the other Class 4 books: Class 4 NCERT books 2026-27
- All Class 1 to 12 NCERT Textbooks: NCERT Books PDF (Class 1–12)
- Every book chapter by chapter: NCERT chapter wise PDF
FAQ
What is a leap year and how many days does February have in a leap year?
A leap year occurs once every 4 years and has 366 days instead of 365, with the extra day added to February as 29 February.
How do you convert PM time into the 24-hour clock?
For times from 1:00 PM to 11:59 PM, add 12 to the hour (for example, 1:00 PM becomes 13:00 hours, 5:20 PM becomes 17:20 hours, and 11:45 PM becomes 23:45 hours).