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Cornerstone · Grades 3–5 Keystones #1 23 November 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 23 November 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄5 + 2⁄6

    Answer: 8⁄15
  2. 2. Algebra Two-step equations

    Solve: 5x + 15 = 70

    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

    Share 57 in the ratio 2:1

    Answer: 38 and 19
  5. 5. Statistics Mean

    Calculate the mean of: 39, 33, 30, 23, 7, 17, 21

    Answer: 24.3

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