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Revision Notes

Prime Time

CBSE · Class 6 · Mathematics

Quick revision notes for Prime Time — CBSE Class 6 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

41 questions60 flashcards5 concepts

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Key Topics to Revise

1

1. Factors, Common Multiples, and Common Factors

  • A factor of a number divides it exactly.
  • The factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24.
  • Numbers that are multiples of both 3 and 5 are common multiples.
2

2. Prime Numbers and Composite Numbers

  • Prime numbers have exactly two factors: 1 and the number itself.
  • The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, and 19.
  • Composite numbers have more than two factors.
3

3. The Sieve of Eratosthenes

  • The Sieve of Eratosthenes is a method for listing primes by circling and crossing out numbers.
  • First cross out 1 because it is neither prime nor composite.
  • Circle 2 and cross out its multiples.
4

4. Co-prime Numbers

  • Two numbers are co-prime if they have no common factor other than 1.
  • The pair 4 and 9 is co-prime.
  • The pair 15 and 39 is not co-prime.

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Full Notes

Key Concepts

A factor divides a number exactlyNumbers with exactly two factorsNumbers with more than two factorsThe number 1 is neither primeTwo numbers are co

Frequently Asked Questions

What are the important topics in Prime Time for CBSE Class 6 Mathematics?
Prime Time covers several key topics that are frequently asked in CBSE Class 6 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Prime Time — CBSE Class 6 Mathematics?
Understand the core concepts first, then work through the 41 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 10 chapters — CBSE Class 6 Mathematics Revision Notes

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