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Cornerstone · Grades 3–5 Keystones #1 21 November 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 21 November 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄5 + 4⁄6

    Answer: 16⁄15
  2. 2. Algebra Two-step equations

    Solve: 8x - 16 = 80

    Answer: x = 12
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 3cm and b = 4cm

    Answer: 5cm
  4. 4. Ratio Sharing in a ratio

    Share 120 in the ratio 1:2

    Answer: 40 and 80
  5. 5. Statistics Mean

    Find the mean of: 3, 12, 18, 17, 6

    Answer: 11.2

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