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Lintel · Grades 5–7 Keystones #1 24 December 2021 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 24 December 2021 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    74000000

    Answer: 7.4 × 107
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 7x + 12

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

    Adjacent = 30cm, angle = 53°. Find opposite

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

    £140.00 is shared between A and B in the ratio 2:3. How much does A receive?

    Answer: £56.00
  5. 5. Statistics Mean

    The mean of 4 numbers is 23. If 3 of them are 17, 15, 35, what is the missing number?

    Answer: 25