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Lintel · Grades 5–7 Keystones #1 18 September 2013 Skills week 1 of 7
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Five GCSE retrieval questions · 18 September 2013 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 170,000 in standard form

    Answer: 1.7 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 6x - 7

    Answer: (x + 1)(x - 7)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 29cm, angle = 31°. Find opposite. Give your answer to 2 decimal places

    Answer: 17.42cm
  4. 4. Ratio Mixed ratio problems

    Simplify the ratio 2kg : 250g

    Answer: 8:1
  5. 5. Statistics Mean

    Calculate the mean of: 39, 39, 39, 17, 24, 49, 31

    Answer: 34

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