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Cornerstone · Grades 3–5 Keystones #1 17 October 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 17 October 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 1⁄10 + 8⁄10

    Answer: 9⁄10
  2. 2. Algebra Two-step equations

    Solve: 6x + 13 = 67

    Answer: x = 9
  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 216 in the ratio 3:3:2

    Answer: 81, 81 and 54
  5. 5. Statistics Mean

    Calculate the mean of: 21, 13, 28, 42, 47, 30

    Answer: 30.2

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