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Cornerstone · Grades 3–5 Keystones #1 23 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 23 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄5 + 1⁄6

    Answer: 17⁄30
  2. 2. Algebra Two-step equations

    Solve: 4x - 13 = 19

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

    Calculate the hypotenuse when a = 6cm and b = 9cm

    Answer: 10.82cm
  4. 4. Ratio Sharing in a ratio

    Divide 117 in the ratio 3:4:2

    Answer: 39, 52 and 26
  5. 5. Statistics Mean

    Calculate the mean of: 7, 16, 35, 22, 9, 19, 5, 21

    Answer: 16.8

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