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Cornerstone · Grades 3–5 Keystones #1 24 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 24 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 4⁄7 + 1⁄5

    Answer: 27⁄35
  2. 2. Algebra Two-step equations

    Solve: 2x - 8 = 8

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

    Calculate the hypotenuse when a = 6cm and b = 15cm

    Answer: 16.16cm
  4. 4. Ratio Sharing in a ratio

    Share 51 in the ratio 1:2

    Answer: 17 and 34
  5. 5. Statistics Mean

    Find the mean of: 3, 19, 4, 7

    Answer: 8.25

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