IGCSE Maths / Powers and roots
Factors, multiples and primes revision notes
Edexcel International GCSE Maths (4MA1), chapter 3: Powers and roots, specification point 1.4d-f. Part of the full course.
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Factors divide exactly into a number, while multiples are made by multiplying it by a whole number. A prime number has exactly two different factors, so these definitions help you list factors and decide whether a number is prime.