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Cornerstone · Grades 3–5 Keystones #1 27 September 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 27 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 5⁄8 + 1⁄5

    Answer: 33⁄40
  2. 2. Algebra Two-step equations

    Solve: 2x - 7 = 11

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

    Calculate the hypotenuse when a = 10cm and b = 14cm

    Answer: 17.2cm
  4. 4. Ratio Sharing in a ratio

    Divide 126 in the ratio 4:1:2

    Answer: 72, 18 and 36
  5. 5. Statistics Mean

    Calculate the mean of: 21, 33, 15, 29, 26, 7, 9, 20

    Answer: 20

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