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Cornerstone · Grades 3–5 Keystones #1 27 March 2025
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Keystones — Cornerstone

Five GCSE retrieval questions · 27 March 2025 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 32 + ? = 190

    Answer: 158
  2. 2. Algebra

    Solve: 7x = 91

    Answer: x = 13
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 8cm and 15cm

    Answer: 17cm
  4. 4. Ratio

    Simplify the ratio 12:21

    Answer: 4:7
  5. 5. Statistics

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

    Answer: 1⁄2

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