How to Find HCF and LCM
Learn how to find the Highest Common Factor (HCF) and Lowest Common Multiple (LCM). Let’s get started! 🚀
Video Lesson
Watch and learn the basics
Flashcards
Review key concepts visually
%20What%20is%20HCF%20and%20LCM.webp)
%20Finding%20HCF%20and%20LCM%20by%20Listing.webp)
%20Finding%20HCF%20and%20LCM%20by%20Prime%20Factorisation.webp)
%20Finding%20HCF%20and%20LCM%20-%20Further%20Example.webp)
🛎️ What Are HCF and LCM?
- HCF (Highest Common Factor) is the biggest factor the numbers share
- LCM (Lowest Common Multiple) is the smallest multiple the numbers share
🛎️ Finding HCF and LCM by Listing
- For HCF, list the factors of each number and choose the largest common one
- For LCM, list the multiples of each number and choose the smallest common one
🛎️ Finding HCF and LCM by Prime Factorisation
- Use prime factorisation for larger numbers or when listing would be long
- Write each number as a product of prime factors
🛎️ Using Prime Factors to Find HCF and LCM
- For HCF, take the common primes with the lowest powers
- For LCM, take all primes with the highest powers
Practice Questions
Test your understanding
Interactive Activity
Visualize HCF and LCM using prime factorisation
Loading interactive widget...
Click here to open ChatCat