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Cornerstone · Grades 3–5 Keystones #1 14 July 2021
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Keystones — Cornerstone

Five GCSE retrieval questions · 14 July 2021 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 78 + 97

    Answer: 78 + 97 = 175
  2. 2. Algebra

    Factorise: 20x + 12

    Answer: 4(5x + 3)
  3. 3. Geometry

    Calculate the area of a circle with diameter 13cm

    Answer: 132.73cm²
  4. 4. Ratio

    Simplify: 6:6:12

    Answer: 1:1:2
  5. 5. Statistics

    A bag has 8 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 4⁄7

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