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Cornerstone · Grades 3–5 Keystones #1 1 August 2021
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Keystones — Cornerstone

Five GCSE retrieval questions · 1 August 2021 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 77 + 38

    Answer: 77 + 38 = 115
  2. 2. Algebra

    For y = x³, find y when x = 3

    Answer: y = 27
  3. 3. Geometry

    Calculate the area of a circle with diameter 9cm

    Answer: 63.62cm²
  4. 4. Ratio

    Simplify: 12:8:6

    Answer: 6:4:3
  5. 5. Statistics

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

    Answer: 12