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Prime Factors, HCF and LCM

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A factor divides a number exactly, and a multiple is a number in its times table. HCF is about common factors, while LCM is about common multiples.

A prime number is greater than 1 and has exactly two factors: 1 and itself. For example, 7 is a factor of 42 because 42÷7=642 \div 7 = 642÷7=6 exactly, while 1 is not prime.

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Question 1

2 marks

Write 40 as a product of its prime factors.

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42÷642 \div 642÷6 gives 7 exactly. What does this show about 6?

Prime Factors, HCF and LCM Revision Guide

  1. GCSE
  2. /Maths
  3. /Prime Factors, HCF and LCM

Revision notes for Edexcel GCSE Maths Prime Factors, HCF and LCM. Open the guide for explanations and worked examples. Written against the Edexcel GCSE Maths (1MA1) specification, so the content matches what's examinable rather than general Maths background.

Revision guides

Practise questions

1 of 5

Write 969696 as a product of prime factors using index notation.