Mastering GCF and LCM: Tips and Tricks for Quick and Easy Calculation
Are you struggling with finding the Highest Common Factor (HCF) — also known as the Greatest Common Factor (GCF) — and the Lowest Common Multiple (LCM) of two or more numbers? If terms like prime factorisation and tree method leave you confused, this tutorial is for you.
In this video, we: • Explain HCF and LCM step by step • Use prime factorisation and the tree method • Show worked examples for 2 and 3 numbers • Highlight common pitfalls and how to avoid them.
📘 Full guide with worked examples and randomly generated, auto-marking practice questions (aligned to the Pearson Edexcel IGCSE syllabus):
👉 https://igcsemathstutor.com/how-to-fi...
On the site you’ll also find: • Unlimited practice problems that refresh each time • Instant feedback with auto-marking • Step-by-step worked examples for exam prep.
🎥 Related video: Prime Factorisation Explained → • Prime factorization using the Tree method
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Chapters
00:00 – Introduction
00:38 – HCF of 2 numbers
01:25 – LCM of 2 numbers
01:40 – HCF of 3 numbers
02:09 – LCM of 3 numbers
03:05 – Examples to try
Related search terms: IGCSE Maths, HCF, GCF, LCM, prime factors, prime factorisation, tree method, worked examples, practice problems.
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