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Cornerstone · Grades 3–5 Keystones #1 27 July 2023
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Keystones — Cornerstone

Five GCSE retrieval questions · 27 July 2023 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 514 + 924

    Answer: 514 + 924 = 1438
  2. 2. Algebra

    Factorise: 8x² + 8x

    Answer: 8x(x + 1)
  3. 3. Geometry

    Opposite = 19cm, adjacent = 9cm. Calculate the angle

    Answer: 64.7°
  4. 4. Ratio

    Simplify: 15:12:18

    Answer: 5:4:6
  5. 5. Statistics

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

    Answer: 6⁄13

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