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Lintel · Grades 5–7 Keystones #1 22 April 2020 Skills week 1 of 7
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Five GCSE retrieval questions · 22 April 2020 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    77000

    Answer: 7.7 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 2x - 8

    Answer: (x + 4)(x - 2)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 14cm, angle = 40°. Find opposite

    Answer: 11.7cm
  4. 4. Ratio Mixed ratio problems

    In ratio 2:3:1, what fraction is the second part?

    Answer: 3⁄6
  5. 5. Statistics Mean

    Calculate the mean of: 11, 36, 22, 43, 33, 5

    Answer: 25

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