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Cornerstone · Grades 3–5 Keystones #1 10 September 2025
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Keystones — Cornerstone

Five GCSE retrieval questions · 10 September 2025 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 48 + ? = 198

    Answer: 150
  2. 2. Algebra

    Factorise: 18x + 48

    Answer: 6(3x + 8)
  3. 3. Geometry

    Calculate the area of a circle with diameter 9cm

    Answer: 63.62cm²
  4. 4. Ratio

    Calculate 25% of 44

    Answer: 11
  5. 5. Statistics

    A bag has 4 red and 7 blue balls. What is the probability of picking a red ball?

    Answer: 4⁄11

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