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Cornerstone · Grades 3–5 Keystones #1 9 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 9 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 2⁄12 + 2⁄12

    Answer: 1⁄3
  2. 2. Algebra Two-step equations

    Solve: 2x + 15 = 29

    Answer: x = 7
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 7cm and b = 6cm

    Answer: 9.22cm
  4. 4. Ratio Sharing in a ratio

    Share 60 in the ratio 1:2

    Answer: 20 and 40
  5. 5. Statistics Mean

    Find the mean of: 12, 9, 20, 15, 3

    Answer: 11.8

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