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Lintel · Grades 5–7 Keystones #1 17 March 2021 Skills week 1 of 7
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Five GCSE retrieval questions · 17 March 2021 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    78000

    Answer: 7.8 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 6x + 9

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

    Adjacent = 22cm, angle = 59°. Find opposite

    Answer: 36.6cm
  4. 4. Ratio Mixed ratio problems

    In ratio 2:4:4, what fraction is the second part?

    Answer: 4⁄10
  5. 5. Statistics Mean

    Calculate the mean of: 36, 13, 31, 44, 42, 42, 38

    Answer: 35.1

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