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4024/12 May/Jun 2020, Question 14: Standard Form

Cambridge O Level Mathematics 4024 · Paper 12 (Non-calculator) · Non-calculator · 3 marks

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The question, in short

Convert Egypt's 2017 population of 97 500 000 to standard form, then estimate Indonesia's population density using its population and area given in standard form.

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

Part (a) · 1 mark

Write 97 500 000 in standard form.

  1. 197 500 000 = 9.75 × 10 000 000
  2. 2= 9.75 × 10⁷

Answer9.75 × 10⁷

Part (b) · 2 marks

Using population 2.62 × 10⁸ and area 2 × 10⁶ km², calculate an estimate of the population density in people per km².

  1. 1Density = population ÷ area
  2. 2= 2.62 × 10⁸ ÷ (2 × 10⁶)
  3. 3= 1.31 × 10² = 131 people per km²

Answer130 or 131 or 150

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