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Revision Notes

A Story of Numbers

CBSE · Class 8 · Mathematics

Quick revision notes for A Story of Numbers — CBSE Class 8 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

113 questions70 flashcards5 concepts

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Key Topics to Revise

1

1. Early Ways of Counting and Representing Numbers

  • One-to-one mapping means matching each object with exactly one stick, mark, or symbol.
  • Tally marks are notches cut on surfaces such as bones or cave walls.
  • The Ishango bone dates back 20,000 to 35,000 years and was discovered in the Democratic Republic of Congo.
2

2. Number Systems Before the Hindu System

  • The Roman number system used I, V, X, L, C, D, and M as landmark numbers.
  • Roman numerals were used in Europe before being replaced by the Hindu number system.
  • Roman numerals were not built on powers of a single base, so large numbers and multiplication were difficult.
3

3. The Idea of Base and Place Value

  • A number system with a base uses powers of one number as landmark numbers.
  • This makes writing and multiplying numbers easier.
  • In the Egyptian system, the landmark numbers are powers of 10.
4

4. Zero and the Hindu Number System

  • The digits 0 to 9 originated and developed in India around 2000 years ago.
  • The first known instance of numbers written using ten digits including 0 as a dot appears in the Bakhshali manuscript, c. 3rd century CE.
  • Aryabhata was the first mathematician to fully explain and do elaborate scientific computations with the Indian system of 10 symbols.

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Full Notes

Key Concepts

Counting begins by matching each objectA number system is a standardNumerals are the symbols usedTally marks are notches cut onThe Gumulgal number names were formed

Frequently Asked Questions

What are the important topics in A Story of Numbers for CBSE Class 8 Mathematics?
A Story of Numbers covers several key topics that are frequently asked in CBSE Class 8 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in A Story of Numbers — CBSE Class 8 Mathematics?
Understand the core concepts first, then work through the 113 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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All 14 chapters — CBSE Class 8 Mathematics Revision Notes

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