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4MA1/1F Jun 2018, Question 10: HCF and LCM

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 4 marks

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The question, in short

Find the LCM of 12 and 20, and the HCF of 24 and 56.

Summarised in our own words. Use the official paper for the exact wording and any diagrams.

Part (a) · 2 marks

Find the lowest common multiple of 12 and 20.

  1. 112 = 2 × 2 × 3
  2. 220 = 2 × 2 × 5
  3. 3LCM = 2 × 2 × 3 × 5
  4. 460

Answer60

Part (b) · 2 marks

Find the highest common factor of 24 and 56.

  1. 124 = 2 × 2 × 2 × 3
  2. 256 = 2 × 2 × 2 × 7
  3. 3HCF = 2 × 2 × 2
  4. 48

Answer8

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