Keystones — Lintel
Five GCSE retrieval questions · 15 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.002 in standard form
Answer: 2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 9
Answer: (x + 9)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.23cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 14:13. What fraction of the marbles are blue?
Answer: 13⁄27 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 15, 50, 39, 26, what is the missing number?
Answer: 40