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Cornerstone · Grades 3–5 Keystones #1 16 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 16 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 4⁄6 + 1⁄7

    Answer: 17⁄21
  2. 2. Algebra Two-step equations

    Solve: 6x - 16 = 44

    Answer: x = 10
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 4cm and b = 13cm

    Answer: 13.6cm
  4. 4. Ratio Sharing in a ratio

    Divide 189 in the ratio 3:4:2

    Answer: 63, 84 and 42
  5. 5. Statistics Mean

    Find the mean of: 15, 13, 20, 10, 3

    Answer: 12.2

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