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Cornerstone · Grades 3–5 Keystones #1 26 September 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 26 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 9⁄12 + 1⁄12

    Answer: 5⁄6
  2. 2. Algebra Two-step equations

    Solve: 7x + 9 = 93

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

    Find the hypotenuse of a right triangle with sides 15cm and 20cm

    Answer: 25cm
  4. 4. Ratio Sharing in a ratio

    Divide 200 in the ratio 2:1:2

    Answer: 80, 40 and 80
  5. 5. Statistics Mean

    Find the mean of: 5, 3, 9, 2

    Answer: 4.75

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