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Cornerstone · Grades 3–5 Keystones #1 10 July 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 10 July 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 4⁄7 + 1⁄7

    Answer: 5⁄7
  2. 2. Algebra Two-step equations

    Solve: 8x - 19 = 37

    Answer: x = 7
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 8cm and b = 9cm

    Answer: 12.04cm
  4. 4. Ratio Sharing in a ratio

    Share 55 in the ratio 1:4

    Answer: 11 and 44
  5. 5. Statistics Mean

    Calculate the mean of: 21, 39, 32, 12, 20, 32, 37

    Answer: 27.6

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