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Lintel · Grades 5–7 Keystones #1 11 November 2024 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 11 November 2024 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    84000000

    Answer: 8.4 × 107
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² + 4x - 21

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

    Adjacent = 18cm, angle = 58°. Find opposite

    Answer: 28.8cm
  4. 4. Ratio Mixed ratio problems

    £312.00 is shared between A and B in the ratio 5:3. How much does A receive?

    Answer: £195.00
  5. 5. Statistics Mean

    The mean of 4 numbers is 27. If 3 of them are 31, 48, 45, what is the missing number?

    Answer: -16