Keystones — Lintel
Five GCSE retrieval questions · 6 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000039 in standard form
Answer: 3.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 60°. Find adjacent side
Answer: 13.5cm -
4. Ratio Mixed ratio problems
Express the second part of 8:15 as a fraction in simplest form
Answer: 15⁄23 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 16, 38, 34, 22, what is the missing number?
Answer: 55