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Cornerstone · Grades 3–5 Keystones #1 30 December 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 30 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄8 + 1⁄5

    Answer: 9⁄20
  2. 2. Algebra Two-step equations

    Solve: 4x - 20 = 20

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

    Calculate the hypotenuse when a = 4cm and b = 11cm

    Answer: 11.7cm
  4. 4. Ratio Sharing in a ratio

    Share 40 in the ratio 2:3

    Answer: 16 and 24
  5. 5. Statistics Mean

    Calculate the mean of: 27, 35, 29, 37, 48, 25

    Answer: 33.5

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