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Cornerstone · Grades 3–5 Keystones #1 6 October 2025
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Keystones — Cornerstone

Five GCSE retrieval questions · 6 October 2025 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 4⁄10 + 5⁄10

    Answer: 9⁄10
  2. 2. Algebra

    Solve: 9x + 2 = 2x + 65

    Answer: x = 9
  3. 3. Geometry

    Calculate the area of a circle with diameter 11cm

    Answer: 95.03cm²
  4. 4. Ratio

    Simplify: 10:6:6

    Answer: 5:3:3
  5. 5. Statistics

    Find the mean of: 9, 12, 6

    Answer: 9

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