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Lintel · Grades 5–7 Keystones #1 18 January 2016 Skills week 1 of 7
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Five GCSE retrieval questions · 18 January 2016 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 230,000,000 in standard form

    Answer: 2.3 × 108
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 7x - 18

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

    Hypotenuse = 32cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places

    Answer: 26.84cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 4:8:10

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

    Calculate the mean of: 25, 5, 7, 17, 24, 35. Give your answer to 2 decimal places

    Answer: 18.83

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