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Cornerstone · Grades 3–5 Keystones #1 10 September 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 10 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄7 + 2⁄4

    Answer: 11⁄14
  2. 2. Algebra Two-step equations

    Solve: 5x + 6 = 51

    Answer: x = 9
  3. 3. Geometry Pythagoras — hypotenuse

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

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

    Divide 104 in the ratio 3:2:3

    Answer: 39, 26 and 39
  5. 5. Statistics Mean

    Calculate the mean of: 8, 31, 50, 17, 24, 18, 29

    Answer: 25.3

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