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Lintel · Grades 5–7 Keystones #1 29 September 2020 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 29 September 2020 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    920000

    Answer: 9.2 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 14x + 49

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

    Adjacent = 26cm, angle = 58°. Find opposite

    Answer: 41.6cm
  4. 4. Ratio Mixed ratio problems

    Simplify: 4:10:6

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

    The mean of 4 numbers is 39. If 3 of them are 29, 24, 34, what is the missing number?

    Answer: 69