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Cornerstone · Grades 3–5 Keystones #1 2 December 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 2 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 7⁄8 + 2⁄7

    Answer: 65⁄56
  2. 2. Algebra Two-step equations

    Solve: 5x - 20 = 10

    Answer: x = 6
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 9cm and b = 7cm

    Answer: 11.4cm
  4. 4. Ratio Sharing in a ratio

    Divide 120 in the ratio 3:1:2

    Answer: 60, 20 and 40
  5. 5. Statistics Mean

    Calculate the mean of: 17, 38, 41, 47, 17, 36

    Answer: 32.7

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