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Lintel · Grades 5–7 Keystones #1 30 October 2021
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Five GCSE retrieval questions · 30 October 2021 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 2⁄3 + 2⁄5 + 1⁄4

    Answer: 79⁄60
  2. 2. Algebra

    Solve: 5x = 65

    Answer: x = 13
  3. 3. Geometry

    Find c if a = 19cm and b = 10cm in a right triangle

    Answer: 21.5cm
  4. 4. Ratio

    Simplify the ratio 6m:600cm

    Answer: 1:100
  5. 5. Statistics

    A bag has 8 red and 7 blue balls. What is the probability of picking a red ball?

    Answer: 8⁄15

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