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Cornerstone · Grades 3–5 Keystones #1 1 November 2023
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Keystones — Cornerstone

Five GCSE retrieval questions · 1 November 2023 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 41 + ? = 181

    Answer: 140
  2. 2. Algebra

    Solve: x + 8 = 26

    Answer: x = 18
  3. 3. Geometry

    Calculate the area of a circle with diameter 10cm

    Answer: 78.54cm²
  4. 4. Ratio

    Simplify: 8:8:16

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

    A bag has 8 red and 4 blue balls. What is the probability of picking a red ball?

    Answer: 2⁄3

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