Keystones — Lintel
Five GCSE retrieval questions · 17 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 470,000,000 in standard form
Answer: 4.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 33
Answer: (x - 3)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.93cm -
4. Ratio Mixed ratio problems
In ratio 5:2:9, what fraction is the second part?
Answer: 1⁄8 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 29, 43, 19, what is the missing number?
Answer: 9