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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.

45 questions24 flashcards5 concepts

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Key Topics to Revise

1

Basic Concepts of Number Systems

  • A number system is a standard sequence of objects, names, or written symbols with a fixed order used for counting
  • Numerals are the symbols representing numbers in a written number system
  • One-to-one mapping is essential for accurate counting - each object corresponds to exactly one symbol or position
2

Early Number Systems

  • Body parts counting: Papua New Guinea tribes used fingers, hands, arms, and body parts in sequence
  • Tally marks: Oldest method using notches on bones (Ishango bone - 20,000-35,000 years old, Lebombo bone - 44,000 years old)
  • Gumulgal system (Australia): Counted in groups of 2 using 'urapon' (1) and 'ukasar' (2)
3

Roman Numerals System

  • Evolved from ancient Greek system around 8th century BCE in Rome
  • Uses landmark numbers: I(1), V(5), X(10), L(50), C(100), D(500), M(1000)
  • Groups numbers starting from largest landmark possible
4

Base Systems and Egyptian Numbers

  • Egyptian system (3000 BCE): Base-10 with landmark numbers as powers of 10
  • Symbols: | (1), ∩ (10), ♂ (100), ⌐ (1000), ※ (10,000), ☽ (100,000), ⟫ (1,000,000)
  • Each landmark number is 10 times the previous one

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Full Notes

Key Concepts

A standard sequence of objectsThe symbols used to represent numbersEasily recognizable reference numbers used asA system where landmark numbersA number system where the position

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?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

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

More resources for A Story of Numbers

All 7 chapters — CBSE Class 8 Mathematics Revision Notes

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