How to Find HCF and LCM
Learn how to find the Highest Common Factor (HCF) and Lowest Common Multiple (LCM) using listing and prime factorisation methods. Letβs get started! π
Video Lesson
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Flashcards
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ποΈ 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
ποΈ 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
ποΈ 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
ποΈ 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
Visualise HCF and LCM using prime factorisation
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