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Cornerstone · Grades 3–5 Keystones #1 22 December 2025
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Keystones — Cornerstone

Five GCSE retrieval questions · 22 December 2025 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 4⁄9 + 4⁄9

    Answer: 8⁄9
  2. 2. Algebra

    Factorise: 9x² + 2x

    Answer: x(9x + 2)
  3. 3. Geometry

    Calculate the distance between (2, 8) and (5, 12)

    Answer: 5
  4. 4. Ratio

    Simplify the ratio 28:20

    Answer: 7:5
  5. 5. Statistics

    What is the probability of rolling a 4 on a fair die?

    Answer: 1⁄6

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