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Lintel · Grades 5–7 Keystones #1 17 July 2012 Skills week 1 of 7
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Five GCSE retrieval questions · 17 July 2012 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 490,000 in standard form

    Answer: 4.9 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 11x + 18

    Answer: (x - 2)(x - 9)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 19cm, angle = 32°. Find opposite. Give your answer to 2 decimal places

    Answer: 11.87cm
  4. 4. Ratio Mixed ratio problems

    Express the first part of 7:10 as a fraction in simplest form

    Answer: 7⁄17
  5. 5. Statistics Mean

    Calculate the mean of: 15, 16, 44, 40, 50, 11. Give your answer to 2 decimal places

    Answer: 29.33

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