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

  1. 1. Number Adding fractions

    Calculate: 1⁄9 + 6⁄9

    Answer: 7⁄9
  2. 2. Algebra Two-step equations

    Solve: 7x + 15 = 99

    Answer: x = 12
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 5cm and b = 13cm

    Answer: 13.93cm
  4. 4. Ratio Sharing in a ratio

    Divide 112 in the ratio 4:1:3

    Answer: 56, 14 and 42
  5. 5. Statistics Mean

    Find the mean of: 6, 5, 12

    Answer: 7.6666666666667

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