Class 4 Maths - CBSE
Ticking Clocks and Turning Calendar
The chapter Ticking Clocks and Turning Calendar in Class 4 CBSE Mathematics introduces students to the essential skills of reading time and managing dates. Learners discover how to read clocks in terms of hours, minutes, and seconds, understand the difference between AM and PM, and convert between 12-hour and 24-hour clock formats. Additionally, students explore the calendar to calculate days, weeks, and months, understanding leap years and the number of days in each month. This chapter builds a strong foundation for time-management skills and is crucial for CBSE exams, where practical word problems on duration and scheduling frequently appear.
Start Learning FreeKey Concepts
Reading the Clock
A clock has a short hour hand and a long minute hand. Each number on the clock face represents 5 minutes when counted by the minute hand.
AM and PM
AM stands for Ante Meridiem and covers the time from midnight to noon. PM stands for Post Meridiem and covers the time from noon to midnight.
Time Conversion
To convert hours to minutes, multiply by 60, because 1 hour is equal to 60 minutes. Similarly, 1 minute is equal to 60 seconds.
The Calendar and Leap Years
A normal year has 365 days, but a leap year occurs every 4 years and has 366 days, with February having 29 days instead of 28.
Duration of Time
Elapsed time or duration is calculated by finding the difference between the starting time and the ending time of an event.
Important Formulas
Board Exam Info
In CBSE Class 4 Mathematics examinations, this chapter typically carries around 6 to 8 marks. Common question types include converting hours to minutes, finding the duration between two given times, reading clock faces, and solving word problems based on calendar dates and leap years.
Frequently Asked Questions
How do I convert hours into minutes?
To convert hours into minutes, simply multiply the given number of hours by 60.
What is a leap year and how do I spot one?
A leap year has 366 days and occurs every 4 years. You can spot a leap year if the year number is completely divisible by 4.
How do we change 12-hour time to 24-hour time?
For times in the PM (except 12 noon), add 12 to the hour value and remove the 'PM'. For AM times, the hour stays the same except for 12 midnight which becomes 00:00.
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