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Cornerstone · Grades 3–5 Keystones #1 9 November 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 9 November 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 2⁄9 + 6⁄9

    Answer: 8⁄9
  2. 2. Algebra Two-step equations

    Solve: 5x - 10 = 15

    Answer: x = 5
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 11cm and b = 5cm

    Answer: 12.08cm
  4. 4. Ratio Sharing in a ratio

    Divide 171 in the ratio 3:2:4

    Answer: 57, 38 and 76
  5. 5. Statistics Mean

    Find the mean of: 19, 20, 20, 8

    Answer: 16.75

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