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Lintel · Grades 5–7 Keystones #1 25 April 2015 Skills week 1 of 7
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Five GCSE retrieval questions · 25 April 2015 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 21,000 in standard form

    Answer: 2.1 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 8x - 9

    Answer: (x + 1)(x - 9)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 35cm, angle = 33°. Find adjacent side. Give your answer to 2 decimal places

    Answer: 29.35cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 24:20:20

    Answer: 6:5:5
  5. 5. Statistics Mean

    Calculate the mean of: 42, 39, 18, 34, 25, 12. Give your answer to 2 decimal places

    Answer: 28.33

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