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Revision Notes

Playing With Numbers — Revision Notes

ICSE · Class 8 · Mathematics

Playing With Numbers revision notes for ICSE Class 8 Mathematics: 4 topics in quick points. Key terms: A number is written as, A two and A three.

36 questions34 flashcards6 formulas & key relations5 concepts

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Key Topics to Revise

1

1. Generalized Form and Place Value

  • A number in generalized form is written as the sum of products of each digit with its place value.
  • Place value shows the value of a digit according to its position in the number.
  • For 3479, the generalized form is 3 × 1000 + 4 × 100 + 7 × 10 + 9 × 1.
2

2. Properties of Reversed Numbers and Cyclic Numbers

  • When the digits of a two-digit number are reversed, the new number is ba.
  • Property 1: The sum of ab and ba is divisible by 11 and by a + b.
  • Property 2: The difference between ab and ba is divisible by 9 and by the difference of the digits.
3

3. Cryptarithms

  • Cryptarithm is a type of mathematical game consisting of numbers whose digits are represented by letters.
  • The task is to identify the value of each letter.
  • Digit restrictions are important: every letter must represent a single digit from 0 to 9.
4

4. Divisibility Tests

  • Divisibility by 10: a number is divisible by 10 if its unit digit is zero.
  • Divisibility by 5: a number is divisible by 5 if its unit digit is 0 or 5.
  • Divisibility by 2: a number is divisible by 2 if its unit digit is zero or an even number.

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Full Notes

Key Concepts

A number is written asA twoA threeFor a twoFor a two

Frequently Asked Questions

What are the important topics in Playing With Numbers for ICSE Class 8 Mathematics?
Key topics in Playing With Numbers include Generalized Form and Place Value, Properties of Reversed Numbers and Cyclic Numbers, Cryptarithms, Divisibility Tests. Study these first, then practise questions on each for Class 8 exams.
How should I revise Playing With Numbers for Class 8 exams?
Learn the core ideas first, then work through the 36 practice questions on Playing With Numbers. Revise 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.

More resources for Playing With Numbers

All ICSE Class 8 Mathematics Revision Notes

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