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

Five GCSE retrieval questions · 5 April 2025 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 90 + ? = 151

    Answer: 61
  2. 2. Algebra

    Solve: 2x = 26

    Answer: x = 13
  3. 3. Geometry

    Find the distance between (4, 2) and (8, 6)

    Answer: 5.66
  4. 4. Ratio

    Simplify the ratio 10:30

    Answer: 1:3
  5. 5. Statistics

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

    Answer: 3⁄8

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