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Cornerstone · Grades 3–5 Keystones #1 29 March 2021
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Keystones — Cornerstone

Five GCSE retrieval questions · 29 March 2021 · mathsvault.uk/keystones

  1. 1. Number

    Add: 1⁄4 + 1⁄3

    Answer: 7⁄12
  2. 2. Algebra

    Solve: 9x = 81

    Answer: x = 9
  3. 3. Geometry

    Find the area of a circle with radius 7cm

    Answer: 153.94cm²
  4. 4. Ratio

    Simplify: 9:18:18

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

    Find the mean of: 5, 7, 11, 16, 15

    Answer: 10.8

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