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Capstone · Grades 7–9 Keystones #1 4 December 2025
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Keystones — Capstone

Five GCSE retrieval questions · 4 December 2025 · mathsvault.uk/keystones

  1. 1. Number

    The sum of three consecutive numbers is 117. What are the numbers?

    Answer: 38, 39, and 40
  2. 2. Algebra

    Solve: x5 = 7.8

    Answer: x = 39
  3. 3. Geometry

    Find the distance between (-6, -1) and (7, 5)

    Answer: 14.32
  4. 4. Ratio

    Calculate 14.5% of 978

    Answer: 141.81
  5. 5. Statistics

    The mean of 6 numbers is 21. If 5 of them are 42, 33, 39, 25, 45, what is the missing number?

    Answer: -58