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

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

  1. 1. Number Adding fractions

    Add: 2⁄5 + 3⁄4

    Answer: 23⁄20
  2. 2. Algebra Two-step equations

    Solve: 8x - 9 = 39

    Answer: x = 6
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 10cm and b = 11cm

    Answer: 14.87cm
  4. 4. Ratio Sharing in a ratio

    Divide 144 in the ratio 2:1:3

    Answer: 48, 24 and 72
  5. 5. Statistics Mean

    Find the mean of: 10, 3, 15, 6, 20

    Answer: 10.8

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