Keystones — Lintel
Five GCSE retrieval questions · 16 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.047 in standard form
Answer: 4.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 27
Answer: (x + 9)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 46°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.62cm -
4. Ratio Mixed ratio problems
Simplify: 12:9:18
Answer: 4:3:6 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 30, 23, 50, 41, what is the missing number?
Answer: 46