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Lintel · Grades 5–7 Keystones #1 8 June 2013 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 8 June 2013 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 23,000 in standard form

    Answer: 2.3 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 15x + 54

    Answer: (x + 9)(x + 6)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 26cm, angle = 42°. Find opposite. Give your answer to 2 decimal places

    Answer: 23.41cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 6:6:15

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

    Calculate the mean of: 18, 14, 37, 15, 32, 31, 33. Give your answer to 2 decimal places

    Answer: 25.71

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