4MA1/2F Nov 2021, Question 25: Standard Form
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 3 marks
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The question, in short
Work out how many bacteria there are per raindrop, giving the result in standard form to 2 significant figures.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 3 marks
- 1Bacteria per raindrop = 1.75 × 10⁶ ÷ 2.4 × 10⁷
- 2= 0.072916…
- 3= 7.2916… × 10⁻²
- 4= 7.3 × 10⁻² (2 s.f.)
Answer7.3 × 10⁻²
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