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Lintel · Grades 5–7 Keystones #1 14 September 2015 Skills week 1 of 7
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Five GCSE retrieval questions · 14 September 2015 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 87,000 in standard form

    Answer: 8.7 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 8x + 16

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

    Hypotenuse = 30cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places

    Answer: 18.47cm
  4. 4. Ratio Mixed ratio problems

    Simplify the ratio 5m : 65cm

    Answer: 100:13
  5. 5. Statistics Mean

    Calculate the mean of: 47, 17, 28, 7, 46, 31, 16, 22

    Answer: 26.75

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