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Cornerstone · Grades 3–5 Keystones #20 20 January 2026
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Keystones — Cornerstone

Five GCSE retrieval questions · 20 January 2026 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 9⁄11 + 1⁄11

    Answer: 10⁄11
  2. 2. Algebra

    Solve: x + 8 = 12

    Answer: x = 4
  3. 3. Geometry

    Opposite = 6cm, hypotenuse = 12cm. Find the angle

    Answer: 30° (approximately)
  4. 4. Ratio

    Simplify the ratio 40:15

    Answer: 8:3
  5. 5. Statistics

    Find the range of: 31, 28, 18, 18, 26

    Answer: 13

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