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Cornerstone · Grades 3–5 Keystones #1 6 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 6 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 7⁄10 + 2⁄10

    Answer: 9⁄10
  2. 2. Algebra Two-step equations

    Solve: 3x + 11 = 41

    Answer: x = 10
  3. 3. Geometry Pythagoras — hypotenuse

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

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

    Share 70 in the ratio 3:4

    Answer: 30 and 40
  5. 5. Statistics Mean

    Find the mean of: 6, 6, 20, 13, 19

    Answer: 12.8

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