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Cornerstone · Grades 3–5 Keystones #1 13 June 2021
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Keystones — Cornerstone

Five GCSE retrieval questions · 13 June 2021 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 78 + 30

    Answer: 78 + 30 = 108
  2. 2. Algebra

    Solve: 9x = 72

    Answer: x = 8
  3. 3. Geometry

    Calculate the area of a circle with diameter 17cm

    Answer: 226.98cm²
  4. 4. Ratio

    Simplify: 20:16:12

    Answer: 5:4:3
  5. 5. Statistics

    What is the probability of getting heads when flipping a fair coin?

    Answer: 1⁄2

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