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Cornerstone · Grades 3–5 Keystones #1 12 November 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 12 November 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 10⁄12 + 1⁄12

    Answer: 11⁄12
  2. 2. Algebra Two-step equations

    Solve: 3x + 11 = 26

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

    Find the hypotenuse of a right triangle with sides 20cm and 21cm

    Answer: 29cm
  4. 4. Ratio Sharing in a ratio

    Divide 125 in the ratio 2:1:2

    Answer: 50, 25 and 50
  5. 5. Statistics Mean

    Calculate the mean of: 11, 9, 6, 42, 26, 15

    Answer: 18.2

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