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Lintel · Grades 5–7 Keystones #1 18 May 2015 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 18 May 2015 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 66,000,000 in standard form

    Answer: 6.6 × 107
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 15x + 54

    Answer: (x + 9)(x + 6)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 27cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places

    Answer: 18.41cm
  4. 4. Ratio Mixed ratio problems

    Express the second part of 2:15 as a fraction in simplest form

    Answer: 15⁄17
  5. 5. Statistics Mean

    Calculate the mean of: 12, 14, 21, 17, 9, 8, 28, 50. Give your answer to 2 decimal places

    Answer: 19.88

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