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Cornerstone · Grades 3–5 Keystones #57 26 February 2026
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Keystones — Cornerstone

Five GCSE retrieval questions · 26 February 2026 · mathsvault.uk/keystones

  1. 1. Number

    Find the total of 246, 273, and 107

    Answer: 626
  2. 2. Algebra

    Factorise: 3x² + 8x

    Answer: x(3x + 8)
  3. 3. Geometry

    Find the hypotenuse of a right triangle with sides 6cm and 8cm

    Answer: 10cm
  4. 4. Ratio

    Simplify the ratio 15:9

    Answer: 5:3
  5. 5. Statistics

    What is the probability of rolling a 3 on a fair die?

    Answer: 1⁄6

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