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Lintel · Grades 5–7 Keystones #51 5 August 2026
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Keystones — Lintel

Five GCSE retrieval questions · 5 August 2026 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 88 + ? = 142

    Answer: 54
  2. 2. Algebra

    Solve: 2x = 12

    Answer: x = 6
  3. 3. Geometry

    Calculate perimeter: two sides are 11cm and 10cm at right angles

    Answer: 35.9cm
  4. 4. Ratio

    Simplify the ratio 3m:300cm

    Answer: 1:100
  5. 5. Statistics

    A bag has 5 red and 3 blue balls. What is the probability of picking a red ball?

    Answer: 5⁄8

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