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4MA1/1F Jan 2021, Question 22: Standard Form

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 2 marks

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The question, in short

Convert between standard form and ordinary numbers: write 2 840 000 000 in standard form, and write 2.5 × 10⁻⁴ as an ordinary number.

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

Part (a) · 1 mark

Write 2 840 000 000 in standard form.

  1. 12 840 000 000 = 2.84 × 1 000 000 000
  2. 21 000 000 000 = 10⁹
  3. 32.84 × 10⁹

Answer2.84 × 10⁹

Part (b) · 1 mark

Write 2.5 × 10⁻⁴ as an ordinary number.

  1. 12.5 × 10⁻⁴ = 2.5 ÷ 10 000
  2. 22.5 ÷ 10 000 = 0.00025

Answer0.00025

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