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Cornerstone · Grades 3–5 Keystones #115 25 April 2026
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Keystones — Cornerstone

Five GCSE retrieval questions · 25 April 2026 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 158 + 998

    Answer: 158 + 998 = 1156
  2. 2. Algebra

    What is the next term? 7, 21, 63, 189, ...

    Answer: 567
  3. 3. Geometry

    Calculate the perimeter of a right triangle with sides 8cm and 8cm

    Answer: 27.3cm
  4. 4. Ratio

    Simplify: 6:15:6

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

    A bag has 6 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 1⁄2

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