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Cornerstone · Grades 3–5 Keystones #1 18 March 2023
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Keystones — Cornerstone

Five GCSE retrieval questions · 18 March 2023 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 65 + 61

    Answer: 65 + 61 = 126
  2. 2. Algebra

    Solve: 5x = 55

    Answer: x = 11
  3. 3. Geometry

    Find the perimeter of a right triangle with sides 6cm, 8cm, 10cm

    Answer: 24cm
  4. 4. Ratio

    Simplify: 4:6:4

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

    A bag has 7 red and 6 blue balls. What is the probability of picking a red ball?

    Answer: 7⁄13

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