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Cornerstone · Grades 3–5 Keystones #1 17 September 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 17 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄3 + 2⁄4

    Answer: 5⁄6
  2. 2. Algebra Two-step equations

    Solve: 6x + 5 = 77

    Answer: x = 12
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 3cm and b = 11cm

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

    Share 18 in the ratio 2:1

    Answer: 12 and 6
  5. 5. Statistics Mean

    Find the mean of: 14, 20, 20, 9, 10

    Answer: 14.6

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