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Cornerstone · Grades 3–5 Keystones #1 10 July 2022
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Keystones — Cornerstone

Five GCSE retrieval questions · 10 July 2022 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 39 + 68

    Answer: 39 + 68 = 107
  2. 2. Algebra

    Factorise: 12x + 9

    Answer: 3(4x + 3)
  3. 3. Geometry

    Calculate the area of a circle with diameter 9cm

    Answer: 63.62cm²
  4. 4. Ratio

    Simplify: 12:8:8

    Answer: 3:2:2
  5. 5. Statistics

    A bag has 7 red and 5 blue balls. What is the probability of picking a red ball?

    Answer: 7⁄12

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