Keystones — Lintel
Five GCSE retrieval questions · 21 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0005 in standard form
Answer: 5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 16x + 63
Answer: (x - 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 33.86cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 14:10. What fraction of the counters are red?
Answer: 7⁄12 -
5. Statistics Mean
Calculate the mean of: 15, 21, 31, 11, 45, 28, 18, 38. Give your answer to 2 decimal places
Answer: 25.88