Keystones — Lintel
Five GCSE retrieval questions · 25 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 950,000,000 in standard form
Answer: 9.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 9
Answer: (x - 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.84cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 2:14. What fraction of the marbles are purple?
Answer: 7⁄8 -
5. Statistics Mean
The mean of 5 numbers is 24. If 4 of them are 16, 27, 33, 16, what is the missing number?
Answer: 28