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4MA1/1H Jun 2025, Question 1: LCM using prime factors

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1H (Higher) · Calculator · 5 marks

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The question, in short

Find the lowest common multiple of 45 and 70.

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

Part (a) · 1 mark

  1. 1The highest frequency is 40
  2. 2This is for 5 < d ≤ 10

Answer5 < d ≤ 10

Part (b) · 4 marks

  1. 1Midpoints: 2.5, 7.5, 12.5, 17.5, 22.5
  2. 22.5 × 26 + 7.5 × 40 + 12.5 × 16 + 17.5 × 10 + 22.5 × 8
  3. 3= 65 + 300 + 200 + 175 + 180 = 920
  4. 4920 ÷ 100 = 9.2

Answer9.2

Stuck on a step? Read the free lesson: Estimating the Mean for Grouped Data

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