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Cornerstone · Grades 3–5 Keystones #1 27 August 2025
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Keystones — Cornerstone

Five GCSE retrieval questions · 27 August 2025 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 45 + ? = 186

    Answer: 141
  2. 2. Algebra

    Factorise: 9x + 18

    Answer: 3(3x + 6)
  3. 3. Geometry

    Calculate the area of a circle with diameter 14cm

    Answer: 153.94cm²
  4. 4. Ratio

    Simplify: 12:12:18

    Answer: 2:2:3
  5. 5. Statistics

    A bag has 7 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 7⁄13

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