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Lintel · Grades 5–7 Keystones #1 6 July 2010 Skills week 1 of 7
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Five GCSE retrieval questions · 6 July 2010 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 22,000 in standard form

    Answer: 2.2 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 10x - 24

    Answer: (x + 2)(x - 12)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 24cm, angle = 60°. Find opposite. Give your answer to 2 decimal places

    Answer: 41.57cm
  4. 4. Ratio Mixed ratio problems

    Divide 88 in the ratio 1:1:2

    Answer: 22, 22 and 44
  5. 5. Statistics Mean

    Calculate the mean of: 15, 34, 32, 12, 7, 41

    Answer: 23.5

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