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Lintel · Grades 5–7 Keystones #1 16 September 2010 Skills week 1 of 7
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Five GCSE retrieval questions · 16 September 2010 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 380,000 in standard form

    Answer: 3.8 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 5x - 24

    Answer: (x + 8)(x - 3)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 13cm, angle = 33°. Find opposite. Give your answer to 2 decimal places

    Answer: 8.44cm
  4. 4. Ratio Mixed ratio problems

    Express the second part of 10:4 as a fraction in simplest form

    Answer: 2⁄7
  5. 5. Statistics Mean

    Calculate the mean of: 13, 49, 22, 48, 29, 40

    Answer: 33.5

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