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Lintel · Grades 5–7 Keystones #1 16 October 2014 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 16 October 2014 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 3,900,000 in standard form

    Answer: 3.9 × 106
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 6x - 27

    Answer: (x + 9)(x - 3)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 19cm, angle = 39°. Find opposite. Give your answer to 2 decimal places

    Answer: 15.39cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 4:6:4

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

    Calculate the mean of: 9, 49, 26, 43, 26, 37, 46. Give your answer to 2 decimal places

    Answer: 33.71

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