Keystones — Lintel
Five GCSE retrieval questions · 5 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 91,000,000 in standard form
Answer: 9.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.45cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 13:10. What fraction of the marbles are white?
Answer: 10⁄23 -
5. Statistics Mean
Calculate the mean of: 28, 49, 9, 13, 5, 35, 22
Answer: 23