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Lintel · Grades 5–7 Keystones #1 3 February 2013 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 3 February 2013 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 840,000,000 in standard form

    Answer: 8.4 × 108
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 4x - 5

    Answer: (x + 5)(x - 1)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 12cm, angle = 31°. Find opposite. Give your answer to 2 decimal places

    Answer: 7.21cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 8:10:10

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

    Calculate the mean of: 49, 8, 6, 31, 38, 32. Give your answer to 2 decimal places

    Answer: 27.33

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