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Cornerstone · Grades 3–5 Keystones #1 28 September 2025
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Keystones — Cornerstone

Five GCSE retrieval questions · 28 September 2025 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 225 + 317

    Answer: 225 + 317 = 542
  2. 2. Algebra

    Solve: 3x = 15

    Answer: x = 5
  3. 3. Geometry

    Calculate the area of a circle with diameter 21cm

    Answer: 346.36cm²
  4. 4. Ratio

    Calculate 50% of 98

    Answer: 49
  5. 5. Statistics

    Calculate the mean of: 33, 16, 25, 38, 8, 9, 28

    Answer: 22.4