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Cornerstone · Grades 3–5 Keystones #1 30 July 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 30 July 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄3 + 6⁄7

    Answer: 25⁄21
  2. 2. Algebra Two-step equations

    Solve: 8x - 18 = 46

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

    Calculate the hypotenuse when a = 11cm and b = 15cm

    Answer: 18.6cm
  4. 4. Ratio Sharing in a ratio

    Share 76 in the ratio 1:3

    Answer: 19 and 57
  5. 5. Statistics Mean

    Find the mean of: 4, 18, 4, 17

    Answer: 10.75

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