Keystones — Lintel
Five GCSE retrieval questions · 10 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000013 in standard form
Answer: 1.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 27
Answer: (x + 9)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 48°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.04cm -
4. Ratio Mixed ratio problems
Express the second part of 11:13 as a fraction in simplest form
Answer: 13⁄24 -
5. Statistics Mean
Calculate the mean of: 46, 40, 17, 23, 49, 49. Give your answer to 2 decimal places
Answer: 37.33