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

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

  1. 1. Number Adding fractions

    Add: 3⁄8 + 3⁄7

    Answer: 45⁄56
  2. 2. Algebra Two-step equations

    Solve: 5x - 20 = 35

    Answer: x = 11
  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

    Divide 210 in the ratio 2:2:1

    Answer: 84, 84 and 42
  5. 5. Statistics Mean

    Calculate the mean of: 25, 34, 31, 36, 9, 39, 21, 27

    Answer: 27.8

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