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Cornerstone · Grades 3–5 Keystones #1 19 September 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 19 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 2⁄9 + 1⁄9

    Answer: 1⁄3
  2. 2. Algebra Two-step equations

    Solve: 5x - 13 = 12

    Answer: x = 5
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 9cm and 12cm

    Answer: 15cm
  4. 4. Ratio Sharing in a ratio

    Share 45 in the ratio 2:3

    Answer: 18 and 27
  5. 5. Statistics Mean

    Calculate the mean of: 30, 40, 49, 24, 36, 12, 14, 26

    Answer: 28.9

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