Keystones — Lintel
Five GCSE retrieval questions · 1 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.067 in standard form
Answer: 6.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 18x + 77
Answer: (x - 7)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.77cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 8:11. What fraction of the counters are orange?
Answer: 8⁄19 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 39, 36, 17, 28, 28, what is the missing number?
Answer: 50