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Lintel · Grades 5–7 Keystones #1 27 January 2023 Skills week 1 of 7
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Five GCSE retrieval questions · 27 January 2023 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    39000

    Answer: 3.9 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 13x + 42

    Answer: (x - 7)(x - 6)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 26cm, angle = 52°. Find opposite

    Answer: 33.3cm
  4. 4. Ratio Mixed ratio problems

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

    Answer: 3⁄10
  5. 5. Statistics Mean

    Calculate the mean of: 31, 33, 50, 50, 26, 40, 12

    Answer: 34.6

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