IGCSE Maths / Powers and roots
HCF and LCM
Edexcel International GCSE Maths (4MA1), chapter 3: Powers and roots, specification point 1.4e. Part of the full course.
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The highest common factor (HCF) is the largest factor shared by numbers, while the lowest common multiple (LCM) is the smallest multiple they share. Prime factorisation gives a reliable way to find both and to choose the right one in worded questions.