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

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

  1. 1. Number

    Calculate: 793 + 696

    Answer: 793 + 696 = 1489
  2. 2. Algebra

    Solve: 3x = 21

    Answer: x = 7
  3. 3. Geometry

    Find the area of a circle with radius 4cm

    Answer: 50.27cm²
  4. 4. Ratio

    Simplify: 24:24:12

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

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

    Answer: 1⁄2

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