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

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

  1. 1. Number Adding fractions

    Add: 1⁄8 + 4⁄5

    Answer: 37⁄40
  2. 2. Algebra Two-step equations

    Solve: 7x + 13 = 76

    Answer: x = 9
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 6cm and b = 15cm

    Answer: 16.16cm
  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: 45, 10, 15, 33, 39, 21, 47

    Answer: 30

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