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Lintel · Grades 5–7 Keystones #1 24 December 2020 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 24 December 2020 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    0.00037

    Answer: 3.7 × 10^-4
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 6x - 7

    Answer: (x + 7)(x - 1)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 21cm, angle = 54°. Find opposite

    Answer: 28.9cm
  4. 4. Ratio Mixed ratio problems

    £282.00 is shared between A and B in the ratio 2:1. How much does A receive?

    Answer: £188.00
  5. 5. Statistics Mean

    The mean of 4 numbers is 35. If 3 of them are 15, 47, 44, what is the missing number?

    Answer: 34