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Cornerstone · Grades 3–5 Keystones #1 23 July 2025 Skills week 1 of 7
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Five GCSE retrieval questions · 23 July 2025 · mathsvault.uk/keystones

  1. 1. Number Adding fractions

    Add: 1⁄3 + 1⁄4

    Answer: 7⁄12
  2. 2. Algebra Two-step equations

    Solve: 6x + 15 = 57

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

    Find the hypotenuse of a right triangle with sides 20cm and 21cm

    Answer: 29cm
  4. 4. Ratio Sharing in a ratio

    Divide 120 in the ratio 1:3:1

    Answer: 24, 72 and 24
  5. 5. Statistics Mean

    Find the mean of: 11, 18, 20

    Answer: 16.333333333333

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