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Cornerstone · Grades 3–5 Keystones #19 19 January 2026
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Keystones — Cornerstone

Five GCSE retrieval questions · 19 January 2026 · mathsvault.uk/keystones

  1. 1. Number

    84000

    Answer: 8.4 × 104
  2. 2. Algebra

    Solve: x + 4 = 18

    Answer: x = 14
  3. 3. Geometry

    Calculate the area of a circle with diameter 8cm

    Answer: 50.27cm²
  4. 4. Ratio

    Simplify the ratio 16:10

    Answer: 8:5
  5. 5. Statistics

    A bag has 3 red and 8 blue balls. What is the probability of picking a red ball?

    Answer: 3⁄11

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