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Cornerstone · Grades 3–5 Keystones #1 13 October 2021
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Keystones — Cornerstone

Five GCSE retrieval questions · 13 October 2021 · mathsvault.uk/keystones

  1. 1. Number

    900000

    Answer: 9 × 105
  2. 2. Algebra

    Solve: 9x = 90

    Answer: x = 10
  3. 3. Geometry

    Opposite = 8cm, hypotenuse = 9.2cm. Find the angle

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

    Simplify the ratio 15:10

    Answer: 3:2
  5. 5. Statistics

    Calculate the mean of: 19, 35, 38, 16, 48, 10

    Answer: 27.7

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