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Lintel · Grades 5–7 Keystones #1 16 February 2015 Skills week 1 of 7
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Five GCSE retrieval questions · 16 February 2015 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 830,000 in standard form

    Answer: 8.3 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 13x + 12

    Answer: (x + 12)(x + 1)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 18cm, angle = 32°. Find opposite. Give your answer to 2 decimal places

    Answer: 11.25cm
  4. 4. Ratio Mixed ratio problems

    Express the second part of 10:15 as a fraction in simplest form

    Answer: 3⁄5
  5. 5. Statistics Mean

    Calculate the mean of: 32, 39, 26, 10, 9, 46

    Answer: 27

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