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Cornerstone · Grades 3–5 Keystones #121 1 May 2026
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Keystones — Cornerstone

Five GCSE retrieval questions · 1 May 2026 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 47 + ? = 106

    Answer: 59
  2. 2. Algebra

    Solve: x + 8 = 18

    Answer: x = 10
  3. 3. Geometry

    Find the area of a circle with radius 9cm

    Answer: 254.47cm²
  4. 4. Ratio

    Simplify: 10:12:12

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

    A bag has 7 red and 7 blue balls. What is the probability of picking a red ball?

    Answer: 1⁄2

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