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

Five GCSE retrieval questions · 7 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄4 + 7⁄8

    Answer: 11⁄8
  2. 2. Algebra Two-step equations

    Solve: 7x - 10 = 88

    Answer: x = 14
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 12cm and 16cm

    Answer: 20cm
  4. 4. Ratio Sharing in a ratio

    Share 35 in the ratio 4:3

    Answer: 20 and 15
  5. 5. Statistics Mean

    Calculate the mean of: 34, 38, 38, 11, 34, 24, 35, 38

    Answer: 31.5

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