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Lintel · Grades 5–7 Keystones #1 31 March 2014 Skills week 1 of 7
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Five GCSE retrieval questions · 31 March 2014 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 39,000 in standard form

    Answer: 3.9 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 4x - 12

    Answer: (x + 2)(x - 6)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 15cm, angle = 34°. Find opposite. Give your answer to 2 decimal places

    Answer: 10.12cm
  4. 4. Ratio Mixed ratio problems

    Express the first part of 3:14 as a fraction in simplest form

    Answer: 3⁄17
  5. 5. Statistics Mean

    Calculate the mean of: 10, 10, 9, 10, 37, 46, 37, 11

    Answer: 21.25

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