Keystones — Lintel
Five GCSE retrieval questions · 23 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 76,000,000 in standard form
Answer: 7.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 30
Answer: (x + 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.5cm -
4. Ratio Mixed ratio problems
In ratio 2:10:9, what fraction is the third part?
Answer: 3⁄7 -
5. Statistics Mean
Calculate the mean of: 9, 40, 30, 14, 47, 40, 43. Give your answer to 2 decimal places
Answer: 31.86