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Cornerstone · Grades 3–5 Keystones #1 8 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 8 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄5 + 2⁄4

    Answer: 9⁄10
  2. 2. Algebra Two-step equations

    Solve: 8x - 15 = 49

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

    Find the hypotenuse of a right triangle with sides 9cm and 12cm

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

    Share 50 in the ratio 1:4

    Answer: 10 and 40
  5. 5. Statistics Mean

    Calculate the mean of: 29, 39, 47, 37, 39, 21

    Answer: 35.3

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