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Lintel · Grades 5–7 Keystones #1 26 October 2021 Skills week 1 of 7
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Five GCSE retrieval questions · 26 October 2021 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    740000

    Answer: 7.4 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 9x + 20

    Answer: (x - 4)(x - 5)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 39cm, angle = 25°. Find adjacent side

    Answer: 35.3cm
  4. 4. Ratio Mixed ratio problems

    In ratio 3:1:4, what fraction is the second part?

    Answer: 1⁄8
  5. 5. Statistics Mean

    Calculate the mean of: 45, 36, 5, 10, 36, 6

    Answer: 23

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