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Lintel · Grades 5–7 Keystones #1 19 April 2021 Skills week 1 of 7
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Five GCSE retrieval questions · 19 April 2021 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    500000

    Answer: 5 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 6x + 9

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

    Hypotenuse = 23cm, angle = 55°. Find adjacent side

    Answer: 13.2cm
  4. 4. Ratio Mixed ratio problems

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

    Answer: 1⁄8
  5. 5. Statistics Mean

    Calculate the mean of: 29, 7, 25, 42, 37, 21, 7, 28

    Answer: 24.5

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