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Lintel · Grades 5–7 Keystones #1 13 August 2010 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 13 August 2010 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 52,000,000 in standard form

    Answer: 5.2 × 107
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 7x + 10

    Answer: (x + 5)(x + 2)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 23cm, angle = 35°. Find opposite. Give your answer to 2 decimal places

    Answer: 16.cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 12:12:18

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

    Calculate the mean of: 10, 22, 25, 7, 45, 20, 41. Give your answer to 2 decimal places

    Answer: 24.29

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