Keystones — Lintel
Five GCSE retrieval questions · 14 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.074 in standard form
Answer: 7.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 9
Answer: (x + 9)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 9.04cm -
4. Ratio Mixed ratio problems
In ratio 9:12:2, what fraction is the first part?
Answer: 9⁄23 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 46, 31, 17, 49, what is the missing number?
Answer: 17