Keystones — Lintel
Five GCSE retrieval questions · 2 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.047 in standard form
Answer: 4.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.8cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 6:14. What fraction of the marbles are orange?
Answer: 3⁄10 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 47, 22, 28, 23, what is the missing number?
Answer: 60