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Lintel · Grades 5–7 Keystones #1 19 September 2010 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 19 September 2010 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 36,000,000 in standard form

    Answer: 3.6 × 107
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 11x + 24

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

    Adjacent = 23cm, angle = 33°. Find opposite. Give your answer to 2 decimal places

    Answer: 14.94cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 9:6:12

    Answer: 3:2:4
  5. 5. Statistics Mean

    Calculate the mean of: 40, 32, 6, 49, 40, 28, 10. Give your answer to 2 decimal places

    Answer: 29.29

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