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LCM by the factor method, and choosing GCD or LCM

Mathematics · Grade 7 · about 40 minutes

Find the least common multiple from highest prime powers, use it for packing and meeting times, and choose GCD or LCM from the story.

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  • 10 sections of explanation, worked examples and diagrams
  • 1 practice task with hints and worked answers
  • A quiz that marks itself as you go
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Other lessons in this sub-strand

  1. Divisibility by 2, 5 and 10
  2. Divisibility by 3, 6 and 9
  3. Divisibility by 4, 8 and 11
  4. Composite numbers and listing factors
  5. Prime factorisation
  6. GCD by the factor method
  7. LCM by the factor method, and choosing GCD or LCM