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Cornerstone · Grades 3–5 Keystones #1 31 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 31 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 2⁄12 + 9⁄12

    Answer: 11⁄12
  2. 2. Algebra Two-step equations

    Solve: 4x - 18 = -2

    Answer: x = 4
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 7cm and b = 9cm

    Answer: 11.4cm
  4. 4. Ratio Sharing in a ratio

    Share 25 in the ratio 2:3

    Answer: 10 and 15
  5. 5. Statistics Mean

    Find the mean of: 11, 10, 5, 19

    Answer: 11.25

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