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Cornerstone · Grades 3–5 Keystones #138 18 May 2026
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Keystones — Cornerstone

Five GCSE retrieval questions · 18 May 2026 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 64 + ? = 160

    Answer: 96
  2. 2. Algebra

    Solve: x + 3 = 17

    Answer: x = 14
  3. 3. Geometry

    Opposite = 19cm, adjacent = 9cm. Calculate the angle

    Answer: 64.7°
  4. 4. Ratio

    Find 17% of 457

    Answer: 77.69
  5. 5. Statistics

    A bag has 8 red and 3 blue balls. What is the probability of picking a red ball?

    Answer: 8⁄11

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