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Cornerstone · Grades 3–5 Keystones #1 4 October 2025
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Keystones — Cornerstone

Five GCSE retrieval questions · 4 October 2025 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 89 + 47

    Answer: 89 + 47 = 136
  2. 2. Algebra

    Solve: 10x - 5 = 6x + 35

    Answer: x = 10
  3. 3. Geometry

    Opposite = 17cm, adjacent = 14cm. Calculate the angle

    Answer: 50.5°
  4. 4. Ratio

    Simplify: 24:24:20

    Answer: 6:6:5
  5. 5. Statistics

    Calculate the mean of: 49, 49, 26, 24, 34, 48

    Answer: 38.3