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Lintel · Grades 5–7 Keystones #1 13 December 2025
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Keystones — Lintel

Five GCSE retrieval questions · 13 December 2025 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 50 + ? = 145

    Answer: 95
  2. 2. Algebra

    Solve: 9x = 63

    Answer: x = 7
  3. 3. Geometry

    Calculate perimeter: two sides are 14cm and 9cm at right angles

    Answer: 39.6cm
  4. 4. Ratio

    Simplify: 18:9:15

    Answer: 6:3:5
  5. 5. Statistics

    A bag has 3 red and 4 blue balls. What is the probability of picking a red ball?

    Answer: 3⁄7

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