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.
Question 1
2 marksWrite 40 as a product of its prime factors.
42÷642 \div 642÷6 gives 7 exactly. What does this show about 6?
Prime Factors, HCF and LCM Revision Guide
Revision notes for WJEC GCSE Maths Prime Factors, HCF and LCM: explanations and worked examples.