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Cornerstone · Grades 3–5 Keystones #1 8 December 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 8 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄3 + 3⁄8

    Answer: 25⁄24
  2. 2. Algebra Two-step equations

    Solve: 7x + 3 = 66

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

    Calculate the hypotenuse when a = 8cm and b = 10cm

    Answer: 12.81cm
  4. 4. Ratio Sharing in a ratio

    Share 28 in the ratio 1:3

    Answer: 7 and 21
  5. 5. Statistics Mean

    Calculate the mean of: 44, 23, 23, 45, 49, 10, 38, 14

    Answer: 30.8

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