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Cornerstone · Grades 3–5 Keystones #1 2 February 2023
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Keystones — Cornerstone

Five GCSE retrieval questions · 2 February 2023 · mathsvault.uk/keystones

  1. 1. Number

    Calculate: 648 + 828

    Answer: 648 + 828 = 1476
  2. 2. Algebra

    Factorise: 30x + 35

    Answer: 5(6x + 7)
  3. 3. Geometry

    Opposite = 10cm, hypotenuse = 20cm. Find the angle

    Answer: 30° (approximately)
  4. 4. Ratio

    Simplify the ratio 10:6

    Answer: 5:3
  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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