NCERT Class 7 Mathematics Ganita Prakash: Chapter 1 — Large Numbers Around Us
This chapter, 'A Lakh Varieties!', from NCERT's Class 7 Mathematics (Ganita Prakash), introduces the concept of large numbers, specifically focusing on 'one lakh'. It uses a relatable story about a farmer, Eshwarappa, and his children, Roxie and Estu, discussing the vast number of rice varieties that once existed. The chapter prompts students to understand the magnitude of one lakh by observing number patterns, starting from the largest 3-digit number and progressing to the smallest 6-digit number, which is one lakh. It encourages critical thinking about how many varieties could be tasted in a lifetime, introducing calculations involving days in a year and lifespan. This chapter aims to build foundational understanding of large numbers and their practical implications for young learners in the CBSE curriculum.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 7 |
| Subject | Mathematics |
| Book | Ganita Prakash |
| Chapter | Chapter 1 — Large Numbers Around Us |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 3 minutes |
| Word count | 403 |
Learning outcomes
- Understand the concept and magnitude of 'one lakh'.
- Identify patterns in numbers to determine the smallest and largest numbers of different digit lengths.
- Relate large numbers to real-world scenarios.
- Perform basic calculations involving days and years to estimate quantities.
- Develop an appreciation for the vastness of numbers.
Vocabulary
| Word | Meaning |
|---|---|
| Lakh | A unit of quantity equal to one hundred thousand (1,00,000). |
| Indigenous | Originating or occurring naturally in a particular place; native. |
| Varieties | Different kinds or sorts of something. |
| Overheard | Heard something that one was not intended to hear. |
| Magnitude | Great size or extent of something. |
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Practice questions
- What is the largest 3-digit number? Answer: 999
- What is the smallest 4-digit number? Answer: 1000
- How is 1,00,000 read? Answer: One Lakh
- What is the largest 5-digit number? Answer: 99,999
- What is the smallest 6-digit number? Answer: 1,00,000
Frequently asked questions
What is the main concept introduced in NCERT Class 7 Mathematics Chapter 1?
The chapter introduces the concept of large numbers, focusing on understanding the magnitude of 'one lakh' and observing number patterns.
What is 'one lakh' in numerical form?
One lakh is numerically represented as 1,00,000.
How does the chapter explain the concept of a lakh?
It uses a story about rice varieties and number patterns, showing the progression from 3-digit to 6-digit numbers.
What is the largest 5-digit number?
The largest 5-digit number is 99,999.
What is the smallest 6-digit number?
The smallest 6-digit number is 1,00,000, which is also known as one lakh.
What real-world context is used in the chapter?
The chapter uses the context of a farmer discussing the historical number of rice varieties in the country.
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Topics covered
NCERT Class 7 Mathematics — Ganita Prakash — Chapter 1 — Large Numbers Around Us. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.