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

Five GCSE retrieval questions · 1 January 2011 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 870,000,000 in standard form

    Answer: 8.7 × 108
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 4x - 60

    Answer: (x + 6)(x - 10)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 23cm, angle = 43°. Find opposite. Give your answer to 2 decimal places

    Answer: 21.45cm
  4. 4. Ratio Mixed ratio problems

    Divide 225 in the ratio 4:1:4

    Answer: 100, 25 and 100
  5. 5. Statistics Mean

    Calculate the mean of: 40, 6, 31, 18, 50, 28, 44

    Answer: 31

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