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

Five GCSE retrieval questions · 3 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 1⁄6 + 3⁄6

    Answer: 2⁄3
  2. 2. Algebra Two-step equations

    Solve: 8x - 10 = 54

    Answer: x = 8
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 11cm and b = 15cm

    Answer: 18.6cm
  4. 4. Ratio Sharing in a ratio

    Divide 144 in the ratio 4:4:1

    Answer: 64, 64 and 16
  5. 5. Statistics Mean

    Find the mean of: 12, 6, 13, 14, 3

    Answer: 9.6

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