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Cornerstone · Grades 3–5 Keystones #14 14 January 2026
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Keystones — Cornerstone

Five GCSE retrieval questions · 14 January 2026 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 72 + ? = 182

    Answer: 110
  2. 2. Algebra

    Factorise: 6x² + 8x

    Answer: 2x(3x + 4)
  3. 3. Geometry

    Calculate perimeter: two sides are 14cm and 15cm at right angles

    Answer: 49.5cm
  4. 4. Ratio

    Calculate 25% of 168

    Answer: 42
  5. 5. Statistics

    What is the probability of rolling a 3 on a fair die?

    Answer: 1⁄6

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