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Cornerstone · Grades 3–5 Keystones #1 28 November 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 28 November 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 6⁄8 + 1⁄8

    Answer: 7⁄8
  2. 2. Algebra Two-step equations

    Solve: 3x + 15 = 39

    Answer: x = 8
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 7cm and 24cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Divide 91 in the ratio 1:4:2

    Answer: 13, 52 and 26
  5. 5. Statistics Mean

    Find the mean of: 13, 20, 17, 5, 18

    Answer: 14.6

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