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Cornerstone · Grades 3–5 Keystones #1 12 December 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 12 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 5⁄9 + 3⁄9

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

    Solve: 6x + 15 = 75

    Answer: x = 10
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 5cm and b = 12cm

    Answer: 13cm
  4. 4. Ratio Sharing in a ratio

    Share 25 in the ratio 4:1

    Answer: 20 and 5
  5. 5. Statistics Mean

    Calculate the mean of: 19, 20, 14, 35, 31, 41

    Answer: 26.7

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