NCERT Class 4 Mathematics Maths Mela Chapter 12 Ticking Clocks and Turning Calendar PDF Download

Chapter 12: Ticking Clocks and Turning Calendar

Parv is celebrating his birthday with his friends. Let us join them.

I was born on 29 February 2016. Years having the date 29 February are called leap years. Such years have one additional day in the year and occur every four years.

Let Us Do

1. Notice the number of days in February in the years 2024 and 2025.

   [Figure: FEB 2024 and FEB 2025 calendars showing February with 29 days in 2024 and 28 days in 2025, See in your textbook]

   Number of days in Feb 2024 = _____________

   Number of days in Feb 2025 = _____________

2. Fill in the blanks with consecutive leap years before and after 2024.

   ________, ________, 2024, ________, ________, ________

3. We know that most years have 365 days. How many days would a leap year have?
4. Write the names of the months when you celebrate your favourite festivals.

   Name of the Festival	Name of the Month

5. Answer the following questions by writing the appropriate days of the week:
   1. Today: _______________
   2. Yesterday: _______________
   3. Tomorrow: _______________
   4. Day after tomorrow: _______________
   5. Day before yesterday: ________________
6. July 1 is a Monday. Write the dates for the next two Mondays.

   ___________________________________________

7. Laali is born on 04/07/2014 and Chotu is born on 04/12/2019. Who is older among the two and how much?

   Laali will turn 5 years old on ______________.

   Chotu's 10th birthday will be celebrated on ________________.

   Do You Know?

   04/07/2024 is a date in DD/MM/YYYY format. And this is read as 4th of July 2024 or July 4, 2024.

8. Check the manufacturing and expiry dates on the wrapper of any biscuit packet.
   1. How old is the packet of biscuits?

      Answer: ____ months ____ days.

   2. How many more days are the biscuits safe to eat?

      Answer: ____ months ____ days.

9. Notice the day on which July 15 falls in your calendar. Now find out what day is August 15? September 15? October 15? What pattern do you notice? Share in grade.

   Now choose a date and look up the day on which it falls. Challenge your friends to guess what day will the same date fall in the following month.

Teacher's Note

When counting days between two dates, remember that leap years occur every four years and have 29 days in February instead of 28. To find someone's age, count from their birth year to the current year, being careful about whether their birthday has passed this year. Practice this with a few examples to get comfortable with the pattern.

Let Us Explore

With the help of your parents and teachers, explore the names of the months in the Hindu/Islamic/Sikh or any other calendar of your community.

1. Find out when the year begins in each of these calendars.
2. Check how the names of the months in these calenders correspond to the months in the English calendar.
3. Identify the months from the Hindu/Islamic/Sikh or any other calendar in which some of the important festivals of the community fall.
4. Identify the dates of the new moon and full moon in your community's calendar every month. Do you notice any pattern?
5. How are the full moon or new moon days named in your community's calendar?

Note for Teacher

Students may be asked to collect wrappers of different items and make a table of expiry periods for them.

How many hours in a day?

Look at the picture below. It shows the time spent on different activities by a doctor. Write the number of hours spent on each activity in the space provided. Then, find the total number of hours between 6 o'clock morning to 6 o'clock evening and 6 o'clock morning of the next day.

[Figure: A 24-hour clock diagram showing a doctor's daily activities including waking up, cooking, going to hospital, staying at hospital, spending time with children, dinner and TV, and sleeping, with times marked from 6:00 AM to 6:00 PM and continuing through midnight. Each activity section has a blank line for hours to be filled in, See in your textbook]

......Hrs

......Hrs

......Hrs

......Hrs

......Hrs

......Hrs

......Hrs

......Hrs

.....Hrs

The total number of hours is ________ .

Note for Teachers

Help the children count the duration of the activities in the picture given above and find the total number of hours in a day.

Note for Teacher

Help children understand the difference between AM and PM and how it eases communication about time among people. You may seek children's routine experiences and associate them with AM and PM. You may draw their attention to the 24-hour clock and how it shows time and make children practice reading and writing it.

In both the pictures we see 8:00 on the clock. But one is morning and the other is night time. We add AM and PM to show this difference.

[Figure: Two clocks showing 8:00 AM (morning scene with girl eating) and 8:00 PM (evening scene with girl cooking), See in your textbook]

Digital clocks help us read the time more clearly.

[Figure: Two digital clocks showing 08:00 (for 8:00 AM) and 20:00 (for 8:00 PM), See in your textbook]

Read the following table and see how we read and write time using AM/PM and the digital clock. Discuss what you notice about the two different ways.

Key Points

• A leap year occurs every four years and has 29 days in February instead of 28, giving it 366 days instead of the usual 365 days.
• AM stands for morning times (from midnight to noon) and PM stands for afternoon and evening times (from noon to midnight). The same time like 8:00 can be either AM or PM depending on whether it is morning or night.
• A digital clock uses 24-hour format where times after noon are shown as 13:00, 14:00, and so on, making it clear whether the time is morning or evening without needing AM or PM.
• There are 24 hours in a complete day and night cycle, which you can count by tracking all the activities from 6:00 AM one day until 6:00 AM the next day.

This is a preview of the first 5 pages. To get the complete chapter, click below.