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

Five GCSE retrieval questions · 7 November 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄4 + 2⁄3

    Answer: 7⁄6
  2. 2. Algebra Two-step equations

    Solve: 2x + 12 = 28

    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

    Divide 50 in the ratio 3:1:1

    Answer: 30, 10 and 10
  5. 5. Statistics Mean

    Calculate the mean of: 22, 8, 50, 42, 22, 35, 14

    Answer: 27.6

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