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GCSE Maths | HCF and LCM

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Working out the prime factors of a number

Working out the LCM of two numbers

  • find the prime factors of both numbers
  • add all the numbers to a Venn diagram
  • multiply every number
  • check it is correct by dividing by each number

Working out the HCF of two numbers

  • find the prime factors of both numbers
  • add all the numbers to a Venn diagram
  • multiply every number in the intersection (middle)
  • check it is correct by dividing each number by your answer