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Cornerstone · Grades 3–5 Keystones #1 21 September 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 21 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 3⁄6 + 2⁄6

    Answer: 5⁄6
  2. 2. Algebra Two-step equations

    Solve: 2x + 12 = 28

    Answer: x = 8
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 12cm and 35cm

    Answer: 37cm
  4. 4. Ratio Sharing in a ratio

    Share 80 in the ratio 1:3

    Answer: 20 and 60
  5. 5. Statistics Mean

    Calculate the mean of: 11, 21, 23, 49, 33, 24, 28

    Answer: 27

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