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

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

  1. 1. Number Adding fractions

    Calculate: 6⁄8 + 1⁄8

    Answer: 7⁄8
  2. 2. Algebra Two-step equations

    Solve: 4x + 15 = 27

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

    Calculate the hypotenuse when a = 7cm and b = 6cm

    Answer: 9.22cm
  4. 4. Ratio Sharing in a ratio

    Divide 120 in the ratio 3:2:3

    Answer: 45, 30 and 45
  5. 5. Statistics Mean

    Calculate the mean of: 33, 25, 45, 10, 11, 17, 40, 30

    Answer: 26.4

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