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4MA1/1F Jun 2018, Question 18: Standard Form

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 3 marks

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The question, in short

Convert a number in standard form to an ordinary number, then divide two numbers in standard form and give 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

Write 8 × 10⁴ as an ordinary number.

  1. 110⁴ = 10 000
  2. 28 × 10 000 = 80 000

Answer80 000

Part (b) · 2 marks

Work out (3.5 × 10⁵) ÷ (7 × 10⁸), giving the answer in standard form.

  1. 1Divide the numbers: 3.5 ÷ 7 = 0.5
  2. 2Subtract the powers: 10⁵ ÷ 10⁸ = 10⁻³
  3. 30.5 × 10⁻³ = 5 × 10⁻⁴

Answer5 × 10⁻⁴

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