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Revision Notes

Large Numbers Around Us

CBSE · Class 7 · Mathematics

Quick revision notes for Large Numbers Around Us — CBSE Class 7 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

37 questions60 flashcards5 concepts

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Key Topics to Revise

1

1. Understanding One Lakh and Related Large Numbers

  • 1 lakh is written as 1,00,000 and has 1 followed by 5 zeroes.
  • 1 crore is written as 1,00,00,000 and has 1 followed by 7 zeroes.
  • 1 million is written as 1,000,000 and is equal to ten lakhs.
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2. Estimation, Rounding, and Approximation

  • Exact numbers are not always needed; an approximate number is often enough.
  • Saying that Chintamani's population is about 75,000 gives a good idea of its size.
  • Rounding up means the approximate number is more than the actual number.
3

3. Seeing Large Numbers in Real Life

  • The Statue of Unity in Gujarat is the world's tallest statue at about 180 metres.
  • Kunchikal waterfall in Karnataka drops from a height of about 450 metres.
  • Somu is 1 metre tall, and each floor of the building is about four times his height.
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4. Rapid Counting and Calculator Patterns

  • A +1000 button pressed 100 times makes 1 lakh.
  • A crore is formed when the +1000 button is pressed ten times conceptually from the lakh stage.
  • Using calculator buttons is a way to understand place value.

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Full Notes

Key Concepts

1 lakh = 1 followed byThe Indian number system groups digitsThis system groups digits in setsNumbers are read by grouping digitsExact numbers are not always needed

Frequently Asked Questions

What are the important topics in Large Numbers Around Us for CBSE Class 7 Mathematics?
Large Numbers Around Us covers several key topics that are frequently asked in CBSE Class 7 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Large Numbers Around Us — CBSE Class 7 Mathematics?
Understand the core concepts first, then work through the 37 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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