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Lintel · Grades 5–7 Keystones #1 21 September 2019 Skills week 1 of 7
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Five GCSE retrieval questions · 21 September 2019 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    75000

    Answer: 7.5 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 9x + 18

    Answer: (x - 3)(x - 6)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 35cm, angle = 58°. Find adjacent side

    Answer: 18.5cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 6:10:10

    Answer: 3:5:5
  5. 5. Statistics Mean

    Calculate the mean of: 31, 47, 46, 7, 13, 46, 47, 14

    Answer: 31.4

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