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

Five GCSE retrieval questions · 5 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 3⁄6 + 2⁄4

    Answer: 1⁄1
  2. 2. Algebra Two-step equations

    Solve: 4x - 17 = 31

    Answer: x = 12
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 9cm and b = 4cm

    Answer: 9.85cm
  4. 4. Ratio Sharing in a ratio

    Share 54 in the ratio 1:2

    Answer: 18 and 36
  5. 5. Statistics Mean

    Find the mean of: 10, 12, 5, 7

    Answer: 8.5

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