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Lintel · Grades 5–7 Keystones #1 31 December 2021 Skills week 1 of 7
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Keystones — Lintel

Five GCSE retrieval questions · 31 December 2021 · mathsvault.uk/keystones

  1. 1. Number Converting to standard form

    0.00086

    Answer: 8.6 × 10-4
  2. 2. Algebra Factorising monic quadratics

    Factorise: x² - 7x + 10

    Answer: (x - 2)(x - 5)
  3. 3. Geometry SOHCAHTOA — missing length

    Adjacent = 16cm, angle = 58°. Find opposite

    Answer: 25.6cm
  4. 4. Ratio Mixed ratio problems

    £350.00 is shared between A and B in the ratio 3:4. How much does A receive?

    Answer: £150.00
  5. 5. Statistics Mean

    The mean of 4 numbers is 21. If 3 of them are 23, 41, 43, what is the missing number?

    Answer: -23