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Cornerstone · Grades 3–5 Keystones #1 18 October 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 18 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 3⁄9 + 1⁄9

    Answer: 4⁄9
  2. 2. Algebra Two-step equations

    Solve: 2x + 8 = 16

    Answer: x = 4
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 15cm and 20cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Divide 140 in the ratio 1:4:2

    Answer: 20, 80 and 40
  5. 5. Statistics Mean

    Calculate the mean of: 43, 27, 33, 40, 15, 43

    Answer: 33.5

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