Keystones — Lintel
Five GCSE retrieval questions · 10 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,100,000 in standard form
Answer: 7.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 17x + 72
Answer: (x - 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.93cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 13:9. What fraction of the marbles are orange?
Answer: 13⁄22 -
5. Statistics Mean
Calculate the mean of: 5, 46, 10, 19, 33, 44, 42. Give your answer to 2 decimal places
Answer: 28.43