Keystones — Lintel
Five GCSE retrieval questions · 25 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.091 in standard form
Answer: 9.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 12
Answer: (x + 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 25.21cm -
4. Ratio Mixed ratio problems
In ratio 3:7:9, what fraction is the third part?
Answer: 9⁄19 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 50, 47, 25, 19, 27, what is the missing number?
Answer: 48