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Cornerstone · Grades 3–5 Keystones #1 22 October 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 22 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 8⁄10 + 1⁄10

    Answer: 9⁄10
  2. 2. Algebra Two-step equations

    Solve: 3x + 10 = 31

    Answer: x = 7
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 5cm and 12cm

    Answer: 13cm
  4. 4. Ratio Sharing in a ratio

    Divide 70 in the ratio 1:3:1

    Answer: 14, 42 and 14
  5. 5. Statistics Mean

    Find the mean of: 4, 12, 2, 20, 12

    Answer: 10

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