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0580/12 Feb/Mar 2021, Question 5: Using a Calculator

Cambridge IGCSE Mathematics 0580 · Paper 12 (Core) · Calculator · 3 marks

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The question, in short

Explain why rounding 4896 to 4900 cannot be confirmed as nearest 100, then evaluate (6.4 × 4²)/(17.9 − 6.1) to 3 decimal places.

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Part (a) · 1 mark

Give a reason why 4900 does not prove 4896 was rounded to the nearest 100.

  1. 14896 to the nearest 10 is also 4900
  2. 2So Tanvi may have rounded to the nearest 10, not the nearest 100

AnswerA correct alternative rounding e.g. Tanvi rounded to nearest 10

Part (b) · 2 marks

Work out (6.4 × 4²) divided by (17.9 − 6.1), giving the result to 3 decimal places.

  1. 1Top: 6.4 × 16 = 102.4
  2. 2Bottom: 17.9 − 6.1 = 11.8
  3. 3102.4 ÷ 11.8 = 8.6779…
  4. 4= 8.678 (3 d.p.)

Answer8.678

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