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4MA1/2F Jun 2020, Question 12: HCF and LCM

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 3 marks

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The question, in short

List every whole number that divides 9 exactly, then work out the smallest number that both 15 and 70 divide into.

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

Part (a) · 1 mark

Give every integer that divides 9 with no remainder.

  1. 19 = 1 × 9 = 3 × 3
  2. 2The factors are 1, 3 and 9

Answer1, 3, 9

Part (b) · 2 marks

Work out the smallest number that is a multiple of both 15 and 70.

  1. 115 = 3 × 5
  2. 270 = 2 × 5 × 7
  3. 3LCM = 2 × 3 × 5 × 7 = 210

Answer210

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