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Cornerstone · Grades 3–5 Keystones #1 15 October 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 15 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 1⁄8 + 4⁄8

    Answer: 5⁄8
  2. 2. Algebra Two-step equations

    Solve: 2x - 18 = 8

    Answer: x = 13
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 12cm and 16cm

    Answer: 20cm
  4. 4. Ratio Sharing in a ratio

    Divide 252 in the ratio 4:4:1

    Answer: 112, 112 and 28
  5. 5. Statistics Mean

    Find the mean of: 18, 2, 18

    Answer: 12.666666666667

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