Keystones — Lintel
Five GCSE retrieval questions · 9 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.027 in standard form
Answer: 2.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 80
Answer: (x + 10)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.92cm -
4. Ratio Mixed ratio problems
Express the second part of 10:4 as a fraction in simplest form
Answer: 2⁄7 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 26, 29, 17, 22, what is the missing number?
Answer: 51