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Lintel · Grades 5–7 Keystones #1 2 February 2015 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 2 February 2015 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 710,000 in standard form

    Answer: 7.1 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 6x - 16

    Answer: (x + 8)(x - 2)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 21cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places

    Answer: 8.87cm
  4. 4. Ratio Mixed ratio problems

    Express the second part of 4:10 as a fraction in simplest form

    Answer: 5⁄7
  5. 5. Statistics Mean

    The mean of 5 numbers is 26. If 4 of them are 47, 18, 31, 20, what is the missing number?

    Answer: 14

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