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Lintel · Grades 5–7 Keystones #1 10 July 2010 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 10 July 2010 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 200,000 in standard form

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

    Factorise: x² - 2x - 63

    Answer: (x + 7)(x - 9)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 18cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places

    Answer: 15.74cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 10:6:4

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

    Calculate the mean of: 35, 50, 42, 30, 16, 12, 36, 27

    Answer: 31

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