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Cornerstone · Grades 3–5 Keystones #1 18 September 2025
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Keystones — Cornerstone

Five GCSE retrieval questions · 18 September 2025 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 156 + 393

    Answer: 156 + 393 = 549
  2. 2. Algebra

    Simplify: 6x + 4x

    Answer: 10x
  3. 3. Geometry

    Calculate the hypotenuse when a = 4cm and b = 8cm

    Answer: 8.94cm
  4. 4. Ratio

    Simplify: 18:6:15

    Answer: 6:2:5
  5. 5. Statistics

    Find the mean of: 9, 6, 5

    Answer: 6.6666666666667

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