NCERT Class 4 Mathematics Math-Mela (Sanskrit): Chapter 12 — परिवर्त्यमानं वर्षम्
This chapter, "परिवर्त्यमानं वर्षम्" (Changing Year) from NCERT's Class 4 Mathematics Math-Mela textbook in Sanskrit, introduces students to the concept of leap years and the calendar. It explains that February has 29 days in a leap year, which occurs every four years. The chapter includes activities to observe the number of days in February for different years, identify leap years, and understand the sequence of leap years. It also revisits the days of the week and their sequence, helping students calculate future and past dates. The chapter concludes with a problem involving calculating the age difference between two individuals based on their birth dates, reinforcing the understanding of time and dates within the CBSE curriculum.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 4 |
| Subject | Mathematics |
| Book | Math-Mela (Sanskrit) |
| Chapter | Chapter 12 — परिवर्त्यमानं वर्षम् |
| Language | Sanskrit |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 2 minutes |
| Word count | 202 |
Learning outcomes
- Understand the concept of a leap year and its occurrence.
- Identify the number of days in February during a leap year and a regular year.
- Sequence leap years correctly.
- Reinforce knowledge of days of the week and their order.
- Calculate future and past dates based on given information.
- Solve problems related to age and date differences.
Vocabulary
| Word | Meaning |
|---|---|
| जन्मदिनम् | Birthday |
| फरवरी-मासस्य | Of the month of February |
| अधिक-वर्ष | Leap year |
| अतिरिक्तः | Additional |
| चतुर्वर्षे | In four years |
| दिनानां | Of days |
| सङ्ख्यायाः | Of the number |
| रिक्तस्थानानि | Blanks |
| अधिवर्षेः | Of leap years |
| उत्सवान् | Festivals |
| सप्ताहस्य | Of the week |
| ज्येष्ठः | Elder |
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Practice questions
- 2024 तमे वर्षे फरवरी-मासे कति दिनानि भवन्ति? Answer: 29 दिनानि
- अधिकवर्षं प्रति कति वर्षाणि एकवारं आगच्छति? Answer: चतुर्वर्षे (चार वर्ष में)
- यदि अद्य सोमवासरः अस्ति, तर्हि श्वः कः वारः भविष्यति? Answer: मङ्गलवासरः
- यदि ह्यः शुक्रवारः आसीत्, तर्हि अद्य कः वारः अस्ति? Answer: शनिवासरः
- लाली 07/04/2014 तमे दिनाङ्के जाता। 07/04/2024 तमे दिनाङ्के लाली कति वर्षीया भविष्यति? Answer: 10 वर्षीया
Frequently asked questions
What is a leap year?
A leap year is a year that has an extra day, February 29th, making the year 366 days long. It occurs every four years.
How many days are in February during a leap year?
In a leap year, February has 29 days.
How many days are in February during a regular year?
In a regular year, February has 28 days.
When does the leap year cycle occur?
A leap year occurs every four years.
What does 'श्वः' mean in the context of days?
'श्वः' means tomorrow.
What does 'ह्यः' mean in the context of days?
'ह्यः' means yesterday.
What is the format for dates mentioned in the chapter?
Dates are mentioned in DD/MM/YYYY format, for example, 07/04/2014.
Related resources
Important topics
Topics covered
NCERT Class 4 Mathematics — Math-Mela (Sanskrit) — Chapter 12 — परिवर्त्यमानं वर्षम्. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.