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Chapter 5: Prime Time Notes

Home / Class Notes / Class 6 / Maths / Chapter 5: Prime Time
✓ Free notes Class 6 Maths 1 study file

About these notes

Class 6 Maths Chapter 5 Prime Time gives clear notes that explain prime (अभाज्य संख्या) and composite (भाज्य संख्या) numbers, factors, multiples, divisibility tests and prime factorisation with step-by-step examples, diagrams and quick revision points for exams. Main sub-topics covered: precise definitions and examples, Sieve of Eratosthenes, divisibility rules for 2, 3, 5, 9 and 10, factor trees and prime factor trees (e.g., 360 = 2³ × 3² × 5), and an introduction to using prime factors for HCF and LCM. These notes are for CBSE and Bihar Board Class 6 students preparing for chapter tests, school exams, MCQ practice and timed revision with Merit Spring ROH mock tests.

Key points you will learn

  • Class 6 Maths Chapter 5 Prime Time notes
  • Definition of prime (अभाज्य संख्या) and composite (भाज्य संख्या); 1 is neither
  • Divisibility tests: 2, 3, 5, 9 and 10 (sum-of-digits rule for 3 and 9)
  • Sieve of Eratosthenes to list prime numbers in a range
  • Prime factorisation using factor trees; example 360 = 2³ × 3² × 5
  • Use prime factors to introduce HCF and LCM
  • Common mistakes: confusing factor vs multiple and calling 1 prime

What is inside this chapter

📄

Prime Time - Chapter 5 Notes (Class 6 Maths)

Class 6 Maths Prime Time - Chapter 5 handwritten-style revision notes for CBSE and Bihar Board students.

📥 Open notes

Questions students ask

What is a prime number?

A prime number is a whole number greater than 1 that has exactly two distinct positive divisors: 1 and itself. Examples include 2, 3, 5 and 7; remember that 1 is neither prime nor composite.

How do you do prime factorisation?

Prime factorisation breaks a number into prime factors using a factor tree or repeated division until all factors are prime; for example 360 = 2³ × 3² × 5. This method helps when finding HCF and LCM.

Where to find Class 6 Maths Chapter 5 Prime Time notes and practice?

Find Class 6 Maths Chapter 5 Prime Time notes on Merit Spring ROH for clear definitions and examples; use them for revision, then attempt site-wide chapter tests and mock tests to check understanding and timing.

What are the quick divisibility rules I should remember?

Use simple tests: even numbers divisible by 2; last digit 0 or 5 for 5; sum of digits test for 3 and 9; last digit 0 for 10. These speed up finding factors and solving MCQs.

How to prepare for the chapter test on Prime Time?

Focus on writing definitions, practise prime factor trees, apply divisibility tests on sample numbers, list primes using the sieve, and revise typical mistakes; time yourself on MCQs and chapter-test-style questions.

← Previous chapter Chapter 4: Data Handling and Presentation

More Maths chapters

Chapter 1: Patterns Mathematics Chapter 2: Lines and Angles Chapter 3: Number Play Chapter 4: Data Handling and Presentation Chapter 6: Perimeter and Area Chapter 7: Fractions All chapters →

Class 6 — other subjects

English Science Social Science