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Cornerstone · Grades 3–5 Keystones #1 24 December 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 24 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄3 + 2⁄7

    Answer: 13⁄21
  2. 2. Algebra Two-step equations

    Solve: 2x + 8 = 22

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

    Find the hypotenuse of a right triangle with sides 5cm and 12cm

    Answer: 13cm
  4. 4. Ratio Sharing in a ratio

    Share 75 in the ratio 4:1

    Answer: 60 and 15
  5. 5. Statistics Mean

    Find the mean of: 19, 4, 16, 18, 4

    Answer: 12.2

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