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Lintel · Grades 5–7 Keystones #1 6 December 2020 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 6 December 2020 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    390000

    Answer: 3.9 × 105
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 2x - 24

    Answer: (x + 6)(x - 4)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 23cm, angle = 60°. Find opposite

    Answer: 39.8cm
  4. 4. Ratio Mixed ratio problems

    £161.00 is shared between A and B in the ratio 4:3. How much does A receive?

    Answer: £92.00
  5. 5. Statistics Mean

    The mean of 4 numbers is 39. If 3 of them are 33, 27, 21, what is the missing number?

    Answer: 75