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Lintel · Grades 5–7 Keystones #1 24 January 2015 Skills week 1 of 7
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Five GCSE retrieval questions · 24 January 2015 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 110,000 in standard form

    Answer: 1.1 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 13x + 30

    Answer: (x - 3)(x - 10)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 27cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places

    Answer: 15.49cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 20:8:16

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

    Calculate the mean of: 31, 48, 41, 28, 40, 46, 33, 46. Give your answer to 2 decimal places

    Answer: 39.13

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