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Cornerstone · Grades 3–5 Keystones #1 5 November 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 5 November 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 2⁄3 + 2⁄5

    Answer: 16⁄15
  2. 2. Algebra Two-step equations

    Solve: 3x - 12 = 9

    Answer: x = 7
  3. 3. Geometry Pythagoras — hypotenuse

    Find the hypotenuse of a right triangle with sides 12cm and 16cm

    Answer: 20cm
  4. 4. Ratio Sharing in a ratio

    Divide 96 in the ratio 1:1:2

    Answer: 24, 24 and 48
  5. 5. Statistics Mean

    Find the mean of: 5, 2, 20, 8, 2

    Answer: 7.4

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