Keystones — Lintel
Five GCSE retrieval questions · 20 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 72,000,000 in standard form
Answer: 7.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 11
Answer: (x - 1)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.84cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 15:14. What fraction of the marbles are blue?
Answer: 14⁄29 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 23, 44, 37, what is the missing number?
Answer: 36