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Cornerstone · Grades 3–5 Keystones #1 23 September 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 23 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 3⁄5 + 1⁄5

    Answer: 4⁄5
  2. 2. Algebra Two-step equations

    Solve: 4x - 9 = 51

    Answer: x = 15
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 15cm and 36cm

    Answer: 39cm
  4. 4. Ratio Sharing in a ratio

    Share 60 in the ratio 4:1

    Answer: 48 and 12
  5. 5. Statistics Mean

    Find the mean of: 13, 12, 4, 12

    Answer: 10.25

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