Keystones — Lintel
Five GCSE retrieval questions · 5 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0002 in standard form
Answer: 2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 63°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.89cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 hours : 40 minutes
Answer: 9:2 -
5. Statistics Mean
Calculate the mean of: 38, 22, 9, 10, 50, 40, 42. Give your answer to 2 decimal places
Answer: 30.14