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Cornerstone · Grades 3–5 Keystones #1 8 November 2025 Skills week 1 of 7
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Keystones — Cornerstone

Five GCSE retrieval questions · 8 November 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 4⁄7 + 2⁄5

    Answer: 34⁄35
  2. 2. Algebra Two-step equations

    Solve: 3x + 11 = 20

    Answer: x = 3
  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

    Divide 168 in the ratio 2:2:3

    Answer: 48, 48 and 72
  5. 5. Statistics Mean

    Calculate the mean of: 9, 33, 12, 16, 26, 50

    Answer: 24.3

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