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

  1. 1. Number Adding fractions

    Add: 1⁄4 + 2⁄8

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

    Solve: 3x - 5 = 22

    Answer: x = 9
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 20cm and 21cm

    Answer: 29cm
  4. 4. Ratio Sharing in a ratio

    Share 55 in the ratio 3:2

    Answer: 33 and 22
  5. 5. Statistics Mean

    Calculate the mean of: 18, 50, 42, 37, 49, 9, 47, 38

    Answer: 36.3

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