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Cornerstone · Grades 3–5 Keystones #1 27 October 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 27 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 1⁄8 + 2⁄8

    Answer: 3⁄8
  2. 2. Algebra Two-step equations

    Solve: 7x - 8 = 27

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

    Find the hypotenuse of a right triangle with sides 12cm and 16cm

    Answer: 20cm
  4. 4. Ratio Sharing in a ratio

    Share 76 in the ratio 3:1

    Answer: 57 and 19
  5. 5. Statistics Mean

    Find the mean of: 18, 10, 11

    Answer: 13

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