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Lintel · Grades 5–7 Keystones #1 20 November 2010 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 20 November 2010 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 260,000,000 in standard form

    Answer: 2.6 × 108
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 2x - 24

    Answer: (x + 4)(x - 6)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 24cm, angle = 51°. Find opposite. Give your answer to 2 decimal places

    Answer: 29.64cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 15:6:12

    Answer: 5:2:4
  5. 5. Statistics Mean

    Calculate the mean of: 49, 40, 49, 32, 30, 27, 12, 37

    Answer: 34.5

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