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Cornerstone · Grades 3–5 Keystones #1 20 November 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 20 November 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 1⁄10 + 1⁄10

    Answer: 1⁄5
  2. 2. Algebra Two-step equations

    Solve: 4x + 13 = 57

    Answer: x = 11
  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

    Share 39 in the ratio 1:2

    Answer: 13 and 26
  5. 5. Statistics Mean

    Calculate the mean of: 35, 23, 35, 8, 13, 7, 43, 7

    Answer: 21.4

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