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Lintel · Grades 5–7 Keystones #1 30 October 2016 Skills week 1 of 7
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Five GCSE retrieval questions · 30 October 2016 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    Write 50,000,000 in standard form

    Answer: 5 × 107
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 4x - 60

    Answer: (x + 10)(x - 6)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 13cm, angle = 51°. Find opposite. Give your answer to 2 decimal places

    Answer: 16.05cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 12:9:15

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

    Calculate the mean of: 39, 22, 29, 44, 50, 50

    Answer: 39

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