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Cornerstone · Grades 3–5 Keystones #1 13 February 2023
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Keystones — Cornerstone

Five GCSE retrieval questions · 13 February 2023 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 71 + ? = 122

    Answer: 51
  2. 2. Algebra

    Simplify: 9x + 3x

    Answer: 12x
  3. 3. Geometry

    Calculate the area of a circle with diameter 24cm

    Answer: 452.39cm²
  4. 4. Ratio

    Simplify: 16:16:24

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

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

    Answer: 1⁄2

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