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Lintel · Grades 5–7 Keystones #1 19 September 2017 Skills week 1 of 7
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Five GCSE retrieval questions · 19 September 2017 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 610,000 in standard form

    Answer: 6.1 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 3x - 4

    Answer: (x + 1)(x - 4)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 17cm, angle = 42°. Find opposite. Give your answer to 2 decimal places

    Answer: 15.31cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 10:6:6

    Answer: 5:3:3
  5. 5. Statistics Mean

    Calculate the mean of: 19, 13, 31, 41, 36, 15, 49. Give your answer to 2 decimal places

    Answer: 29.14

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