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Cornerstone · Grades 3–5 Keystones #1 16 December 2025
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Keystones — Cornerstone

Five GCSE retrieval questions · 16 December 2025 · mathsvault.uk/keystones

  1. 1. Number

    What is the missing number: 73 + ? = 143

    Answer: 70
  2. 2. Algebra

    Solve: x + 8 = 15

    Answer: x = 7
  3. 3. Geometry

    Opposite = 13cm, hypotenuse = 15cm. Find the angle

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

    Calculate 10% of 64

    Answer: 6.4
  5. 5. Statistics

    What is the probability of rolling a 6 on a fair die?

    Answer: 1⁄6

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