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Cornerstone · Grades 3–5 Keystones #1 26 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 26 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 5⁄8 + 4⁄5

    Answer: 57⁄40
  2. 2. Algebra Two-step equations

    Solve: 6x + 5 = 53

    Answer: x = 8
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 3cm and b = 7cm

    Answer: 7.62cm
  4. 4. Ratio Sharing in a ratio

    Share 20 in the ratio 3:1

    Answer: 15 and 5
  5. 5. Statistics Mean

    Calculate the mean of: 5, 11, 40, 48, 27, 43, 24

    Answer: 28.3

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