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Lintel · Grades 5–7 Keystones #1 20 January 2018 Skills week 1 of 7
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Five GCSE retrieval questions · 20 January 2018 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 320,000 in standard form

    Answer: 3.2 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 11x + 30

    Answer: (x + 6)(x + 5)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 22cm, angle = 57°. Find opposite. Give your answer to 2 decimal places

    Answer: 33.88cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 12:6:6

    Answer: 2:1:1
  5. 5. Statistics Mean

    Calculate the mean of: 40, 22, 31, 31, 34, 42. Give your answer to 2 decimal places

    Answer: 33.33

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