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Cornerstone · Grades 3–5 Keystones #1 27 December 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 27 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 1⁄6 + 4⁄6

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

    Solve: 2x + 6 = 30

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

    Calculate the hypotenuse when a = 12cm and b = 9cm

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

    Share 36 in the ratio 1:3

    Answer: 9 and 27
  5. 5. Statistics Mean

    Find the mean of: 18, 17, 13, 13

    Answer: 15.25

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