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Lintel · Grades 5–7 Keystones #1 10 June 2021
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Keystones — Lintel

Five GCSE retrieval questions · 10 June 2021 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 54 + ? = 155

    Answer: 101
  2. 2. Algebra

    Solve: 8x = 80

    Answer: x = 10
  3. 3. Geometry

    Calculate the area of a circle with diameter 9cm

    Answer: 63.62cm²
  4. 4. Ratio

    Simplify: 15:9:12

    Answer: 5:3:4
  5. 5. Statistics

    A bag has 7 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 7⁄13

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