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4MA1/1F Jun 2025, Question 25: Standard Form

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

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The question, in short

Convert between standard form and ordinary numbers, then multiply 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

Express 520 million in standard form.

  1. 1520 million = 520 000 000
  2. 2= 5.2 × 10⁸

Answer5.2 × 10⁸

Part (b) · 1 mark

Write 8.79 × 10⁻⁵ as an ordinary number.

  1. 1Move the decimal point 5 places left
  2. 28.79 × 10⁻⁵ = 0.0000879

Answer0.0000879

Part (c) · 2 marks

Calculate (5 × 10⁴²) × (7 × 10⁻¹⁸⁰), giving the answer in standard form.

  1. 15 × 7 = 35
  2. 210⁴² × 10⁻¹⁸⁰ = 10⁻¹³⁸
  3. 335 × 10⁻¹³⁸
  4. 4= 3.5 × 10⁻¹³⁷

Answer3.5 × 10⁻¹³⁷

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