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Cornerstone · Grades 3–5 Keystones #1 10 July 2025
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Keystones — Cornerstone

Five GCSE retrieval questions · 10 July 2025 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 1⁄5 + 3⁄5

    Answer: 4⁄5
  2. 2. Algebra

    Solve: 9x = 108

    Answer: x = 12
  3. 3. Geometry

    Opposite = 8cm, adjacent = 12cm. Calculate the angle

    Answer: 33.7°
  4. 4. Ratio

    Simplify: 8:12:24

    Answer: 2:3:6
  5. 5. Statistics

    A bag has 5 red and 3 blue balls. What is the probability of picking a red ball?

    Answer: 5⁄8

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