Keystones — Lintel
Five GCSE retrieval questions · 16 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.045 in standard form
Answer: 4.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 10
Answer: (x - 2)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.84cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 13:15. What fraction of the marbles are purple?
Answer: 15⁄28 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 46, 31, 31, what is the missing number?
Answer: 48