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Lintel · Grades 5–7 Keystones #1 22 September 2011 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 22 September 2011 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 2,300,000 in standard form

    Answer: 2.3 × 106
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 2x - 8

    Answer: (x + 2)(x - 4)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 29cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places

    Answer: 25.11cm
  4. 4. Ratio Mixed ratio problems

    Express the second part of 3:13 as a fraction in simplest form

    Answer: 13⁄16
  5. 5. Statistics Mean

    Calculate the mean of: 26, 10, 48, 20, 20, 6, 32, 43. Give your answer to 2 decimal places

    Answer: 25.63

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