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Cornerstone · Grades 3–5 Keystones #1 27 July 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 27 July 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 4⁄6 + 1⁄6

    Answer: 5⁄6
  2. 2. Algebra Two-step equations

    Solve: 3x + 15 = 24

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

    Calculate the hypotenuse when a = 10cm and b = 8cm

    Answer: 12.81cm
  4. 4. Ratio Sharing in a ratio

    Share 60 in the ratio 1:2

    Answer: 20 and 40
  5. 5. Statistics Mean

    Calculate the mean of: 9, 24, 14, 32, 30, 19, 21

    Answer: 21.3

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