GCSE Maths (Edexcel)

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Prime Factor Tree

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Number Structure and Calculation

Prime Factor Tree

4:16 Prime Factors
Spec N4
Previous Prime Factorisation Next Highest Common Factor
  • A prime factor tree is used to find all the prime factors of a whole number
  • The prime factorization of a number can be found by multiplying all the prime factors at the ends of the branches
  • The order of the prime factors may change, but the factors themselves will always be the same
  • It doesn't matter how you start the factor tree, as long as you end up with the correct prime factors
  • To find the prime factorization of a number, find factor pairs and continue breaking them down until you reach prime numbers
  • Circle the prime factors and write the prime factorization in index form, if necessary

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