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Lintel · Grades 5–7 Keystones #1 17 September 2018 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 17 September 2018 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    47000

    Answer: 4.7 × 104
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 9x + 18

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

    Adjacent = 24cm, angle = 53°. Find opposite

    Answer: 31.8cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 6:4:8

    Answer: 3:2:4
  5. 5. Statistics Mean

    The mean of 4 numbers is 33. If 3 of them are 47, 42, 23, what is the missing number?

    Answer: 20