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Lintel · Grades 5–7 Keystones #1 9 July 2017 Skills week 1 of 7
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Five GCSE retrieval questions · 9 July 2017 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 9,000,000 in standard form

    Answer: 9 × 106
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 2x - 24

    Answer: (x + 6)(x - 4)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 15cm, angle = 35°. Find opposite. Give your answer to 2 decimal places

    Answer: 10.5cm
  4. 4. Ratio Mixed ratio problems

    Express the first part of 6:3 as a fraction in simplest form

    Answer: 2⁄3
  5. 5. Statistics Mean

    Calculate the mean of: 23, 18, 30, 21, 40, 20. Give your answer to 2 decimal places

    Answer: 25.33

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