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Lintel · Grades 5–7 Keystones #1 25 March 2021 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 25 March 2021 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    22000000

    Answer: 2.2 × 107
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 9x + 20

    Answer: (x - 5)(x - 4)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 23cm, angle = 53°. Find opposite

    Answer: 30.5cm
  4. 4. Ratio Mixed ratio problems

    Divide 110 in the ratio 1:2:2

    Answer: 22, 44 and 44
  5. 5. Statistics Mean

    Calculate the mean of: 25, 13, 24, 21, 22, 23

    Answer: 21.3

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