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Lintel · Grades 5–7 Keystones #1 31 March 2013 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 31 March 2013 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 650,000 in standard form

    Answer: 6.5 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 12x + 20

    Answer: (x + 10)(x + 2)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 18cm, angle = 37°. Find opposite. Give your answer to 2 decimal places

    Answer: 13.56cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 8:8:6

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

    Calculate the mean of: 11, 29, 48, 9, 50, 47, 43. Give your answer to 2 decimal places

    Answer: 33.86

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