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Lintel · Grades 5–7 Keystones #1 27 June 2019 Skills week 1 of 7
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Five GCSE retrieval questions · 27 June 2019 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    1500000

    Answer: 1.5 × 106
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 2x - 15

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

    Adjacent = 14cm, angle = 34°. Find opposite

    Answer: 9.4cm
  4. 4. Ratio Mixed ratio problems

    In ratio 1:3:4, what fraction is the second part?

    Answer: 3⁄8
  5. 5. Statistics Mean

    Calculate the mean of: 8, 9, 7, 39, 9, 41, 34

    Answer: 21

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