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Cornerstone · Grades 3–5 Keystones #1 11 December 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 11 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄6 + 1⁄7

    Answer: 10⁄21
  2. 2. Algebra Two-step equations

    Solve: 3x + 11 = 35

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

    Find the hypotenuse of a right triangle with sides 7cm and 24cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Share 40 in the ratio 3:2

    Answer: 24 and 16
  5. 5. Statistics Mean

    Calculate the mean of: 40, 46, 37, 36, 12, 21

    Answer: 32

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