Keystones — Lintel
Five GCSE retrieval questions · 22 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0062 in standard form
Answer: 6.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 12.06cm -
4. Ratio Mixed ratio problems
In ratio 1:1:4, what fraction is the third part?
Answer: 2⁄3 -
5. Statistics Mean
The mean of 4 numbers is 21. If 3 of them are 17, 16, 41, what is the missing number?
Answer: 10