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4024/22 May/Jun 2025, Question 2: Understanding Decimal Place Value

Cambridge O Level Mathematics 4024 · Paper 22 (Calculator) · Calculator · 3 marks

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The question, in short

Three short number tasks: convert a written number to figures, identify a prime in a range, and find a reciprocal.

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

Part (a) · 1 mark

Write eighteen thousand and twelve using digits.

  1. 1Eighteen thousand = 18000, and twelve = 12
  2. 218000 + 12 = 18012

Answer18012

Part (b) · 1 mark

Give a prime number that lies between 20 and 30.

  1. 1Primes between 20 and 30: 23, 29
  2. 2e.g. 23

Answer23 or 29

Part (c) · 1 mark

Find the reciprocal of 1/9.

  1. 1Reciprocal of 1/9 = 1 ÷ 1/9 = 9

Answer9

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