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Cornerstone · Grades 3–5 Keystones #1 17 December 2021
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Keystones — Cornerstone

Five GCSE retrieval questions · 17 December 2021 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 45 + ? = 111

    Answer: 66
  2. 2. Algebra

    Solve: x + 15 = 27

    Answer: x = 12
  3. 3. Geometry

    Opposite = 12cm, hypotenuse = 13.9cm. Find the angle

    Answer: 60° (approximately)
  4. 4. Ratio

    Simplify: 8:20:12

    Answer: 2:5:3
  5. 5. Statistics

    What is the probability of getting heads when flipping a fair coin?

    Answer: 1⁄2

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