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Lintel · Grades 5–7 Keystones #1 11 October 2011 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 11 October 2011 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 97,000,000 in standard form

    Answer: 9.7 × 107
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 8x - 33

    Answer: (x + 11)(x - 3)
  3. 3. Geometry SOHCAHTOA — missing length

    Hypotenuse = 20cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places

    Answer: 17.14cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 6:6:4

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

    Calculate the mean of: 29, 32, 18, 40, 35, 48, 49. Give your answer to 2 decimal places

    Answer: 35.86

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