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Prime Time — Revision Notes

CBSE · Class 6 · Mathematics

Prime Time revision notes for CBSE Class 6 Mathematics: 4 topics in quick points. Part of the CBSE Class 6 Mathematics syllabus.

41 questions60 flashcards7 formulas & key relations5 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?
Key topics in Prime Time include Factors, Common Multiples, and Common Factors, Prime Numbers and Composite Numbers, The Sieve of Eratosthenes, Co-prime Numbers. Study these first, then practise questions on each for Class 6 exams.
How should I revise Prime Time for Class 6 exams?
Learn the core ideas first, then work through the 41 practice questions on Prime Time. 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.

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All CBSE Class 6 Mathematics Revision Notes

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