Keystones — Lintel
Five GCSE retrieval questions · 29 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 270,000,000 in standard form
Answer: 2.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 15x + 50
Answer: (x - 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.68cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 6:5. What fraction of the counters are red?
Answer: 6⁄11 -
5. Statistics Mean
Calculate the mean of: 40, 44, 44, 38, 17, 14, 19, 39. Give your answer to 2 decimal places
Answer: 31.88