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4MA1/1F Jan 2019, Question 18: Standard Form

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 4 marks

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The question, in short

Using a table of four ocean volumes in km³, convert one value to an ordinary number, total all four volumes, and express another volume in standard form.

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

Part (a) · 1 mark

Write 7.18 × 10⁷ as an ordinary number.

  1. 110⁷ means move the decimal point 7 places right
  2. 27.18 × 10⁷ = 71 800 000

Answer71 800 000

Part (b) · 2 marks

Calculate the total volume of the four oceans listed in the table.

  1. 1As ordinary numbers: 18 800 000 + 310 000 000 + 264 000 000 + 71 800 000
  2. 2Total = 664 600 000 km³
  3. 3In standard form: 6.646 × 10⁸

Answer6.646 × 10⁸

Part (c) · 1 mark

Write 9 880 000 in standard form.

  1. 1Move the decimal point 6 places left to get 9.88
  2. 29 880 000 = 9.88 × 10⁶

Answer9.88 × 10⁶

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