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Lintel · Grades 5–7 Keystones #1 15 December 2022 Skills week 1 of 7
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Five GCSE retrieval questions · 15 December 2022 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    99000

    Answer: 9.9 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 10x + 21

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

    Adjacent = 21cm, angle = 39°. Find opposite

    Answer: 17cm
  4. 4. Ratio Mixed ratio problems

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

    Answer: 2⁄8
  5. 5. Statistics Mean

    Calculate the mean of: 18, 14, 42, 40, 9, 33, 31

    Answer: 26.7

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