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

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

  1. 1. Number

    Calculate: 61 + 43

    Answer: 61 + 43 = 104
  2. 2. Algebra

    Solve: x + 14 = 17

    Answer: x = 3
  3. 3. Geometry

    Calculate the area of a circle with diameter 21cm

    Answer: 346.36cm²
  4. 4. Ratio

    Calculate 10% of 151

    Answer: 15.1
  5. 5. Statistics

    A bag has 7 red and 8 blue balls. What is the probability of picking a red ball?

    Answer: 7⁄15

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