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Cornerstone · Grades 3–5 Keystones #1 31 December 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 31 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 4⁄12 + 2⁄12

    Answer: 1⁄2
  2. 2. Algebra Two-step equations

    Solve: 7x + 8 = 85

    Answer: x = 11
  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

    Share 35 in the ratio 4:1

    Answer: 28 and 7
  5. 5. Statistics Mean

    Find the mean of: 2, 4, 18

    Answer: 8

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