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

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

  1. 1. Number Adding fractions

    Add: 3⁄5 + 1⁄3

    Answer: 14⁄15
  2. 2. Algebra Two-step equations

    Solve: 8x - 8 = 40

    Answer: x = 6
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 4cm and b = 5cm

    Answer: 6.4cm
  4. 4. Ratio Sharing in a ratio

    Divide 200 in the ratio 3:4:3

    Answer: 60, 80 and 60
  5. 5. Statistics Mean

    Calculate the mean of: 25, 5, 50, 29, 39, 47, 16

    Answer: 30.1

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