Keystones — Lintel
Five GCSE retrieval questions · 14 June 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 890,000,000 in standard form
Answer: 8.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 27
Answer: (x + 9)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.6cm -
4. Ratio Mixed ratio problems
Simplify the ratio 7m : 35cm
Answer: 20:1 -
5. Statistics Mean
Calculate the mean of: 19, 30, 22, 43, 15, 42
Answer: 28.5