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Cornerstone · Grades 3–5 Keystones #1 23 March 2023
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Keystones — Cornerstone

Five GCSE retrieval questions · 23 March 2023 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 60 + ? = 163

    Answer: 103
  2. 2. Algebra

    Solve: x + 11 = 20

    Answer: x = 9
  3. 3. Geometry

    Opposite = 11cm, adjacent = 16cm. Calculate the angle

    Answer: 34.5°
  4. 4. Ratio

    Simplify: 15:6:12

    Answer: 5:2:4
  5. 5. Statistics

    A bag has 5 red and 5 blue balls. What is the probability of picking a red ball?

    Answer: 1⁄2

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