Edexcel IGCSE Maths

Revision Notes

1.3.2 HCFs & LCMs

What are HCFs & LCMs?

  • HCF is Highest Common Factor
  • This is the biggest number which is a factor of (divides into) two numbers
  • LCM is Lowest Common Multiple
  • This is the smallest number which two numbers divide into (are factors of)
  • You should remember the first few Prime Numbers:
    2, 3, 5, 7, 11, 13, 17, 19, …

How to find HCFs & LCMs

  1. Find PRIME FACTORS
  2. Create a VENN DIAGRAM
  3. ∩ is HIGHEST COMMON FACTOR (Overlap)
  4. ∪ is LOWEST COMMON MULTIPLE (Union)

Worked Example

HCFs & LCMs Example 1, IGCSE & GCSE Maths revision notes

Venn-Diagram-42-90, IGCSE & GCSE Maths revision notes

HCFs & LCMs Example 2, IGCSE & GCSE Maths revision notes

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