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Cornerstone · Grades 3–5 Keystones #1 14 September 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 14 September 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Calculate: 3⁄6 + 2⁄6

    Answer: 5⁄6
  2. 2. Algebra Two-step equations

    Solve: 2x + 15 = 33

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

    Find the hypotenuse of a right triangle with sides 9cm and 40cm

    Answer: 41cm
  4. 4. Ratio Sharing in a ratio

    Share 45 in the ratio 1:2

    Answer: 15 and 30
  5. 5. Statistics Mean

    Find the mean of: 3, 6, 9, 17

    Answer: 8.75

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