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Cornerstone · Grades 3–5 Keystones #1 3 November 2025
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Keystones — Cornerstone

Five GCSE retrieval questions · 3 November 2025 · mathsvault.uk/keystones

  1. 1. Number

    500000

    Answer: 5 × 105
  2. 2. Algebra

    Expand: 7(x + 3)

    Answer: 7x + 21
  3. 3. Geometry

    Calculate perimeter: two sides are 15cm and 15cm at right angles

    Answer: 51.2cm
  4. 4. Ratio

    Simplify: 8:4:4

    Answer: 2:1:1
  5. 5. Statistics

    What is the probability of getting heads when flipping a fair coin?

    Answer: 1⁄2

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