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Lintel · Grades 5–7 Keystones #1 15 January 2014 Skills week 1 of 7
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Five GCSE retrieval questions · 15 January 2014 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 290,000 in standard form

    Answer: 2.9 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 7x - 18

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

    Adjacent = 16cm, angle = 40°. Find opposite. Give your answer to 2 decimal places

    Answer: 13.43cm
  4. 4. Ratio Mixed ratio problems

    Simplify the ratio 4 hours : 35 minutes

    Answer: 48:7
  5. 5. Statistics Mean

    Calculate the mean of: 13, 7, 9, 39, 29, 41

    Answer: 23

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