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

Five GCSE retrieval questions · 3 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 5⁄7 + 4⁄5

    Answer: 53⁄35
  2. 2. Algebra Two-step equations

    Solve: 6x - 18 = 30

    Answer: x = 8
  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 72 in the ratio 2:1

    Answer: 48 and 24
  5. 5. Statistics Mean

    Calculate the mean of: 16, 18, 10, 45, 27, 14, 29, 38

    Answer: 24.6

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