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4MA1/2FR Jan 2021, Question 19: Standard Form

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

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The question, in short

Table shows coastline lengths in km for five oceans in standard form. Identify the ocean with the longest coastline, then find the difference between the Atlantic and Southern lengths, giving the result in standard form.

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

Part (a) · 1 mark

Identify which of the five oceans listed in the table has the greatest coastline length.

  1. 1Compare the powers of 10 first: only Atlantic and Pacific are × 10⁵
  2. 21.357 is bigger than 1.119, so the greatest is the Pacific

AnswerPacific

Part (b) · 2 marks

Subtract the Southern Ocean coastline length from the Atlantic Ocean length and express the difference in standard form.

  1. 1Atlantic: 1.119 × 10⁵ = 111 900 km
  2. 2Southern: 1.797 × 10⁴ = 17 970 km
  3. 3111 900 − 17 970 = 93 930 = 9.393 × 10⁴

Answer9.393 × 10⁴

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