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Cornerstone · Grades 3–5 Keystones #1 17 December 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 17 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 10⁄12 + 1⁄12

    Answer: 11⁄12
  2. 2. Algebra Two-step equations

    Solve: 8x - 5 = 115

    Answer: x = 15
  3. 3. Geometry Pythagoras — hypotenuse

    Calculate the hypotenuse when a = 11cm and b = 9cm

    Answer: 14.21cm
  4. 4. Ratio Sharing in a ratio

    Divide 187 in the ratio 4:3:4

    Answer: 68, 51 and 68
  5. 5. Statistics Mean

    Calculate the mean of: 35, 8, 19, 38, 34, 39, 23

    Answer: 28

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