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

Five GCSE retrieval questions · 1 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 9⁄11 + 1⁄11

    Answer: 10⁄11
  2. 2. Algebra Two-step equations

    Solve: 5x + 4 = 59

    Answer: x = 11
  3. 3. Geometry Pythagoras — hypotenuse

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

    Answer: 12.73cm
  4. 4. Ratio Sharing in a ratio

    Divide 168 in the ratio 2:3:1

    Answer: 56, 84 and 28
  5. 5. Statistics Mean

    Calculate the mean of: 34, 36, 12, 42, 35, 29

    Answer: 31.3

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