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Cornerstone · Grades 3–5 Keystones #1 20 December 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 20 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 5⁄9 + 1⁄9

    Answer: 2⁄3
  2. 2. Algebra Two-step equations

    Solve: 2x + 5 = 21

    Answer: x = 8
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 11cm and b = 11cm

    Answer: 15.56cm
  4. 4. Ratio Sharing in a ratio

    Divide 184 in the ratio 4:1:3

    Answer: 92, 23 and 69
  5. 5. Statistics Mean

    Calculate the mean of: 18, 12, 27, 36, 48, 41, 49, 24

    Answer: 31.9

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