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Ticking Clocks and Turning Calendar – Class 4 Maths Chapter 12 Notes & NCERT PDF

Class 4MathematicsChapter 12NCERT book: Maths Mela - Class 4

Notes and a simple summary of Chapter 12 of the NCERT Class 4 Mathematics book, with the official chapter PDF, flashcards, an MCQ quiz and an AI tutor for your doubts.

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Chapter 12: Ticking Clocks and Turning Calendar

Introduction

"Ticking Clocks and Turning Calendar" is about time – days, months, years, hours and minutes. It opens at Parv's birthday party. Parv was born on 29 February 2016, and he explains that years with 29 February are called leap years; they have one extra day and come every four years. From calendars, the chapter moves to reading dates, expiry dates, a doctor's day in hours, AM and PM, the 24-hour digital clock, and hours and minutes.

What's in this Chapter

Calendars and leap years – February 2024 has 29 days but February 2025 has 28. Leap years around 2024 are 2016, 2020, 2024, 2028, 2032 and 2036. Most years have 365 days; a leap year has 366.

Days of the week – Children name today, yesterday, tomorrow, the day after tomorrow and the day before yesterday. If 1 July is a Monday, the next two Mondays are 8 July and 15 July.

Reading dates – 04/07/2024 is in DD/MM/YYYY format and is read as 4th of July 2024. Laali was born on 04/07/2014 and Chotu on 04/12/2019, so Laali is older by 5 years and 5 months. Laali turned 5 on 04/07/2019, and Chotu's 10th birthday will be on 04/12/2029.

Expiry dates – Check the manufacturing and expiry dates on a biscuit packet: how old is it and how many more days is it safe to eat?

Calendars of communities – Explore month names in the Hindu, Islamic, Sikh or other calendars, when their years begin, and the new moon and full moon days.

How many hours in a day? – A doctor's day, from waking up at 6 o'clock in the morning to 6 o'clock the next morning, adds up to 24 hours.

AM and PM – 8:00 AM is morning; 8:00 PM is night. A digital 24-hour clock shows 08:00 and 20:00. For example, 12:00 AM = 00:00, 1:00 PM = 13:00 and 11:45 PM = 23:45.

Hours and minutes – Raghav leaves home at 8:20 AM and returns at 8:35 AM: 15 minutes. He starts homework at 10:20 AM and takes 25 minutes, finishing at 10:45 AM. Muneera reads from 4:15 PM for 45 minutes, finishing at 5:00 PM. Akira leaves at 8:00 AM, reaches school at 8:15, assembly finishes at 8:30, dance practice ends at 8:50 and break ends at 9:00.

1 hour = 60 minutes – Half an hour = 30 minutes, a quarter hour (1/4) = 15 minutes, three quarters (3/4) = 45 minutes.

Let Us Check – Raghu, Raghav and Rani read the same clocks differently. Children find who is right and explain the mistakes.

Key Ideas

  • A normal year has 365 days; a leap year has 366, with 29 February.
  • Dates can be written DD/MM/YYYY.
  • A day has 24 hours; AM is before noon and PM is after noon.
  • The 24-hour clock adds 12 to PM hours (3:00 PM = 15:00).
  • 1 hour = 60 minutes; quarter hour = 15 minutes.
  • Activities from the Book

  • Compare February 2024 and 2025 calendars.
  • Record the months of your favourite festivals.
  • Find what day the 15th falls on in July, August, September and October.
  • Fill a table converting AM/PM times to digital clock times.
  • Time yourself boiling milk or filling a bucket.
  • Words to Learn

  • Leap year – year with 366 days (अधिवर्ष)
  • Calendar – chart of days and months (कैलेंडर / पंचांग)
  • Expiry date – last safe day to use (समाप्ति तिथि)
  • AM – before noon (दोपहर से पहले)
  • PM – after noon (दोपहर के बाद)
  • Minute – 60 in an hour (मिनट)
  • Quarter hour – 15 minutes (चौथाई घंटा)
  • Digital clock – clock showing numbers (डिजिटल घड़ी)
  • Tips for Parents & Teachers

  • Hang a calendar and ask daily "What is the date? What day is tomorrow?"
  • Collect food wrappers and compare expiry periods.
  • Practise saying times in both AM/PM and 24-hour form.
  • Time short routines with a stopwatch.
  • Common Mistakes

  • Calling 12:00 PM midnight (it is noon).
  • Reading the hour hand as minutes.
  • Forgetting that February can have 28 or 29 days.
  • 💡 Key Learning Points

    • ✓A normal year has 365 days; a leap year (every four years) has 366 days with 29 February.
    • ✓Dates can be written and read in DD/MM/YYYY format.
    • ✓A day has 24 hours; AM is before noon, PM after noon, and the 24-hour clock adds 12 to PM hours.
    • ✓1 hour = 60 minutes; half hour = 30 minutes; quarter hour = 15 minutes.
    • ✓Elapsed time can be found by counting forward in minutes.

    👨‍🏫 Teaching Tips

    • →Use a real classroom calendar every day to ask date and day questions.
    • →Compare February pages of different years to discover leap years.
    • →Collect wrappers to read manufacturing and expiry dates.
    • →Use a clock with movable hands to show 15, 30 and 45 minutes.
    • →Make a two-column chart of AM/PM and 24-hour times.
    • →Invite children to share festival months from their community calendars.

    📋 Assessment Questions

    1. Can the child identify a leap year and the days in February?
    2. Can the child read and write a date in DD/MM/YYYY?
    3. Can the child convert between AM/PM and 24-hour time?
    4. Can the child find the finishing time after a given number of minutes?
    5. Can the child explain that 1 hour = 60 minutes and 1/4 hour = 15 minutes?

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