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Lintel · Grades 5–7 Keystones #1 28 March 2013 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 28 March 2013 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 840,000 in standard form

    Answer: 8.4 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 14x + 40

    Answer: (x - 4)(x - 10)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 31cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places

    Answer: 14.55cm
  4. 4. Ratio Mixed ratio problems

    Orange and purple counters are in the ratio 2:14. What fraction of the counters are purple?

    Answer: 7⁄8
  5. 5. Statistics Mean

    Calculate the mean of: 9, 21, 24, 23, 23, 31. Give your answer to 2 decimal places

    Answer: 21.83

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