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Lintel · Grades 5–7 Keystones #1 14 January 2017 Skills week 1 of 7
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Five GCSE retrieval questions · 14 January 2017 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 52,000 in standard form

    Answer: 5.2 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 5x - 6

    Answer: (x + 1)(x - 6)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 21cm, angle = 55°. Find opposite. Give your answer to 2 decimal places

    Answer: 29.99cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 4:10:10

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

    Calculate the mean of: 41, 50, 16, 39, 11, 11

    Answer: 28

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