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Cornerstone · Grades 3–5 Keystones #1 15 August 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 15 August 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 5⁄7 + 2⁄5

    Answer: 39⁄35
  2. 2. Algebra Two-step equations

    Solve: 6x + 6 = 24

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

    Calculate the hypotenuse when a = 10cm and b = 12cm

    Answer: 15.62cm
  4. 4. Ratio Sharing in a ratio

    Divide 200 in the ratio 1:3:4

    Answer: 25, 75 and 100
  5. 5. Statistics Mean

    Calculate the mean of: 50, 38, 50, 17, 42, 20, 42, 32

    Answer: 36.4

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