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Cornerstone · Grades 3–5 Keystones #1 10 October 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 10 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 2⁄10 + 4⁄10

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

    Solve: 3x + 8 = 35

    Answer: x = 9
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 10cm and b = 6cm

    Answer: 11.66cm
  4. 4. Ratio Sharing in a ratio

    Share 27 in the ratio 2:1

    Answer: 18 and 9
  5. 5. Statistics Mean

    Find the mean of: 11, 5, 12, 18, 20

    Answer: 13.2

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