Class 6 NCERT • Ganita Prakash Maths Portal
Ch 05: Prime Time
Select a topic or study module below to explore Common Multiples, Sieve of Eratosthenes, Prime Factorisation Trees, Divisibility Rules, “Figure it Out” solutions, and quizzes.
Topic 01 • Factors & Multiples
Idli-Vada Game, Finding Factors, Multiples, Common Factors & Multiples
Topic 02 • Primes & Composites
Prime vs Composite Numbers, Sieve of Eratosthenes (1–100) & Twin Primes
Topic 03 • Factor Trees & Co-primes
Co-prime Pairs, Prime Factorisation Trees & Fundamental Building Blocks
Topic 04 • Divisibility Rules
Tests of Divisibility by 2, 4, 5, 8, 10 & Digit Rules for 3, 6, 9 and 11
Topic 05 • Applications & Puzzles
Checking Divisibility via Prime Factors, Special Numbers & Number Mysteries
Module 06 • Figure it Out & HOTS