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Revision Notes

Number System

ICSE · Class 6 · Mathematics

Quick revision notes for Number System — ICSE Class 6 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

90 questions28 flashcards5 concepts

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Key Topics to Revise

1

1. Digits and Numbers

  • There are 10 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
  • All numbers are formed using these digits, with or without repetition.
  • A number cannot start with 0. For example, 023 is not a valid 3-digit number.
2

2. Place Value and Face Value

  • Place value depends on the position of a digit in a number.
  • Face value is the digit itself, regardless of position.
  • Place value of 0 is always 0, no matter where it is placed.
3

3. Comparing Numbers

  • If numbers have different digits, the one with more digits is greater.
  • If digits are equal, compare from left to right.
  • Use place value charts to compare large numbers step by step.
4

4. Forming Greatest and Smallest Numbers

  • To form the greatest number: arrange digits in descending order.
  • To form the smallest number: arrange digits in ascending order, but never start with 0.
  • If 0 is included, place the smallest non-zero digit first, then 0, then others in ascending order.

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Full Notes

Key Concepts

The face value of a digitTo compare two numbersTo form the greatest numberWe can addEstimation means making a rough calculation

Frequently Asked Questions

What are the important topics in Number System for ICSE Class 6 Mathematics?
Key topics in Number System include Number System Concepts Map, Mind map showing the 10 basic digits and how they can be used to form numbers, Flowchart showing how place value breaks down a number into its component positions. These are the concepts ICSE Class 6 examiners draw on most — study them first, then practise related questions.
How to score full marks in Number System — ICSE Class 6 Mathematics?
Understand the core concepts first, then work through the 90 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 22 chapters — ICSE Class 6 Mathematics Revision Notes

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