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4MA1/2HR Jun 2022, Question 9: Standard Form

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2HR (Higher) · Calculator · 4 marks

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The question, in short

Using a table of five cities' 2018 populations given to 2 significant figures, convert a value, identify the smallest, and find a difference in standard form.

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

Part (a) · 1 mark

Write 8.8 × 10⁶ as an ordinary number.

  1. 18.8 × 10⁶ = 8.8 × 1 000 000 = 8 800 000

Answer8 800 000

Part (b) · 1 mark

State which of the five cities had the least population in 2018.

  1. 1Compare populations: Ahmedabad 7.7 × 10⁶, Barcelona 5.5 × 10⁶, Chicago 8.8 × 10⁶, Lagos 1.3 × 10⁷, Tokyo 3.7 × 10⁷
  2. 2Smallest is 5.5 × 10⁶ → Barcelona

AnswerBarcelona

Part (c) · 2 marks

Find Tokyo's population minus Ahmedabad's, giving the answer in standard form to 2 significant figures.

  1. 1Population of Tokyo = 3.7 × 10⁷ = 37 000 000
  2. 2Population of Ahmedabad = 7.7 × 10⁶ = 7 700 000
  3. 3Difference = 37 000 000 − 7 700 000 = 29 300 000
  4. 429 300 000 = 2.93 × 10⁷
  5. 5Correct to 2 significant figures: 2.9 × 10⁷

Answer2.9 × 10⁷

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