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4MA1/2FR Jan 2020, Question 24: Standard Form

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

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The question, in short

Table gives surface areas of five oceans in standard form; convert one value, identify the smallest ocean, 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 1.56 × 10⁸ as an ordinary number.

  1. 110⁸ = 100 000 000
  2. 21.56 × 100 000 000 = 156 000 000

Answer156 000 000

Part (b) · 1 mark

State which ocean has the least surface area from the table.

  1. 1Compare powers of 10 first: 10⁷ is smaller than 10⁸
  2. 2Of the 10⁷ values, 1.41 × 10⁷ is the smallest
  3. 3So the answer is Arctic

AnswerArctic

Part (c) · 2 marks

Find the difference between the Atlantic and Indian surface areas in square kilometres, giving the result in standard form.

  1. 1Atlantic = 106 000 000, Indian = 68 600 000
  2. 2106 000 000 − 68 600 000 = 37 400 000
  3. 3In standard form: 3.74 × 10⁷

Answer3.74 × 10⁷

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