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Cornerstone · Grades 3–5 Keystones #1 13 December 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 13 December 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 6⁄7 + 2⁄5

    Answer: 44⁄35
  2. 2. Algebra Two-step equations

    Solve: 8x - 19 = 53

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

    Find the hypotenuse of a right triangle with sides 5cm and 12cm

    Answer: 13cm
  4. 4. Ratio Sharing in a ratio

    Share 40 in the ratio 2:3

    Answer: 16 and 24
  5. 5. Statistics Mean

    Find the mean of: 13, 6, 16, 9

    Answer: 11

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