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Cornerstone · Grades 3–5 Keystones #1 25 October 2021
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Keystones — Cornerstone

Five GCSE retrieval questions · 25 October 2021 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 93 + ? = 101

    Answer: 8
  2. 2. Algebra

    What is the next term? 7, 21, 63, 189, ...

    Answer: 567
  3. 3. Geometry

    Calculate the area of a circle with diameter 23cm

    Answer: 415.48cm²
  4. 4. Ratio

    Simplify the ratio 12:8

    Answer: 3:2
  5. 5. Statistics

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

    Answer: 1⁄2

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