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Lintel · Grades 5–7 Keystones #1 15 February 2013 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 15 February 2013 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 26,000,000 in standard form

    Answer: 2.6 × 107
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 5x - 36

    Answer: (x + 9)(x - 4)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 29cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places

    Answer: 14.94cm
  4. 4. Ratio Mixed ratio problems

    Express the first part of 10:13 as a fraction in simplest form

    Answer: 10⁄23
  5. 5. Statistics Mean

    Calculate the mean of: 34, 5, 13, 28, 15, 26, 25. Give your answer to 2 decimal places

    Answer: 20.86

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