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Cornerstone · Grades 3–5 Keystones #1 28 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 28 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 2⁄11 + 6⁄11

    Answer: 8⁄11
  2. 2. Algebra Two-step equations

    Solve: 3x - 12 = 6

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

    Find the hypotenuse of a right triangle with sides 5cm and 12cm

    Answer: 13cm
  4. 4. Ratio Sharing in a ratio

    Share 112 in the ratio 4:3

    Answer: 64 and 48
  5. 5. Statistics Mean

    Find the mean of: 13, 15, 20, 15

    Answer: 15.75

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