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Cornerstone · Grades 3–5 Keystones #1 28 August 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 28 August 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 6⁄7 + 3⁄4

    Answer: 45⁄28
  2. 2. Algebra Two-step equations

    Solve: 6x + 9 = 39

    Answer: x = 5
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 9cm and b = 12cm

    Answer: 15cm
  4. 4. Ratio Sharing in a ratio

    Share 72 in the ratio 3:1

    Answer: 54 and 18
  5. 5. Statistics Mean

    Calculate the mean of: 17, 30, 27, 16, 15, 23, 23

    Answer: 21.6

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