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Cornerstone · Grades 3–5 Keystones #1 25 January 2023
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Keystones — Cornerstone

Five GCSE retrieval questions · 25 January 2023 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 1⁄5 + 1⁄5

    Answer: 2⁄5
  2. 2. Algebra

    Solve: x + 15 = 34

    Answer: x = 19
  3. 3. Geometry

    Calculate the area of a right triangle with perpendicular sides 10cm and 8cm

    Answer: 40cm²
  4. 4. Ratio

    Calculate 10% of 173

    Answer: 17.3
  5. 5. Statistics

    A bag has 3 red and 5 blue balls. What is the probability of picking a red ball?

    Answer: 3⁄8

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