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Cornerstone · Grades 3–5 Keystones #1 10 December 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 10 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 3⁄8 + 1⁄8

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

    Solve: 7x - 7 = 70

    Answer: x = 11
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 9cm and b = 15cm

    Answer: 17.49cm
  4. 4. Ratio Sharing in a ratio

    Share 50 in the ratio 4:1

    Answer: 40 and 10
  5. 5. Statistics Mean

    Find the mean of: 18, 13, 18

    Answer: 16.333333333333

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