Keystones — Lintel
Five GCSE retrieval questions · 16 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000054 in standard form
Answer: 5.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 16
Answer: (x + 2)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.43cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 4:15. What fraction of the marbles are purple?
Answer: 15⁄19 -
5. Statistics Mean
Calculate the mean of: 22, 29, 31, 7, 21, 49, 50. Give your answer to 2 decimal places
Answer: 29.86