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Cornerstone · Grades 3–5 Keystones #1 20 October 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 20 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 7⁄10 + 1⁄10

    Answer: 4⁄5
  2. 2. Algebra Two-step equations

    Solve: 4x - 17 = 31

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

    Find the hypotenuse of a right triangle with sides 9cm and 12cm

    Answer: 15cm
  4. 4. Ratio Sharing in a ratio

    Divide 189 in the ratio 2:4:1

    Answer: 54, 108 and 27
  5. 5. Statistics Mean

    Calculate the mean of: 24, 33, 16, 30, 20, 41, 19, 20

    Answer: 25.4

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