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Revision Notes

Factors and Multiples

ICSE · Class 5 · Mathematics

Quick revision notes for Factors and Multiples — ICSE Class 5 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

46 questions35 flashcards4 concepts

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Key Topics to Revise

1

1. Factors and Multiples

  • A factor of a number divides it exactly without leaving a remainder.
  • Every number is a factor of itself and 1 is a factor of every number.
  • Multiples are found by multiplying a number with whole numbers (1, 2, 3...).
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2. Prime and Composite Numbers

  • Prime numbers have exactly two factors: 1 and the number itself.
  • 2 is the only even prime number.
  • Composite numbers have more than two factors.
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3. Co-prime and Twin Prime Numbers

  • Co-prime numbers have only 1 as a common factor.
  • Two prime numbers are always co-prime.
  • Consecutive numbers are always co-prime.
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4. HCF (Highest Common Factor)

  • HCF is the largest number that divides two or more numbers exactly.
  • Can be found by listing common factors or using prime factorization.
  • Division method is best for large numbers.

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Full Notes

Key Concepts

A factor is a numberA prime number has only twoThe Highest Common Factor (HCF)These are shortcuts to check if

Frequently Asked Questions

What are the important topics in Factors and Multiples for ICSE Class 5 Mathematics?
Factors and Multiples covers several key topics that are frequently asked in ICSE Class 5 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Factors and Multiples — ICSE Class 5 Mathematics?
Understand the core concepts first, then work through the 46 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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