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Lintel · Grades 5–7 Keystones #1 24 August 2010 Skills week 1 of 7
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Five GCSE retrieval questions · 24 August 2010 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 290,000 in standard form

    Answer: 2.9 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 5x - 24

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

    Adjacent = 23cm, angle = 50°. Find opposite. Give your answer to 2 decimal places

    Answer: 27.41cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 9:6:12

    Answer: 3:2:4
  5. 5. Statistics Mean

    Calculate the mean of: 33, 17, 40, 31, 30, 6. Give your answer to 2 decimal places

    Answer: 26.17

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