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0580/23 May/Jun 2024, Question 17: Standard Form

Cambridge IGCSE Mathematics 0580 · Paper 23 (Extended) · Calculator · 4 marks

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The question, in short

Work out two calculations involving numbers in standard form, giving each answer in standard form.

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

Part (a) · 2 marks

Multiply (2.1 × 10¹⁰¹) by (8 × 10¹⁰¹), giving the answer in standard form.

  1. 12.1 × 8 = 16.8 and 10¹⁰¹ × 10¹⁰¹ = 10²⁰²
  2. 216.8 × 10²⁰² = 1.68 × 10²⁰³

Answer1.68 × 10²⁰³

Part (b) · 2 marks

Add (2.1 × 10¹⁰¹) and (2.1 × 10¹⁰⁰), giving the answer in standard form.

  1. 12.1 × 10¹⁰⁰ = 0.21 × 10¹⁰¹
  2. 22.1 × 10¹⁰¹ + 0.21 × 10¹⁰¹ = 2.31 × 10¹⁰¹

Answer2.31 × 10¹⁰¹

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