Keystones — Lintel
Five GCSE retrieval questions · 19 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.071 in standard form
Answer: 7.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 60
Answer: (x + 10)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 59°. Find adjacent side. Give your answer to 2 decimal places
Answer: 7.73cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 10:7. What fraction of the marbles are blue?
Answer: 7⁄17 -
5. Statistics Mean
Calculate the mean of: 43, 18, 43, 20, 31, 23. Give your answer to 2 decimal places
Answer: 29.67