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Cornerstone · Grades 3–5 Keystones #1 30 September 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 30 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 2⁄5 + 1⁄5

    Answer: 3⁄5
  2. 2. Algebra Two-step equations

    Solve: 6x + 11 = 71

    Answer: x = 10
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 11cm and b = 13cm

    Answer: 17.03cm
  4. 4. Ratio Sharing in a ratio

    Divide 144 in the ratio 2:1:3

    Answer: 48, 24 and 72
  5. 5. Statistics Mean

    Find the mean of: 16, 19, 18, 12

    Answer: 16.25

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