Keystones — Lintel
Five GCSE retrieval questions · 25 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00021 in standard form
Answer: 2.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 10
Answer: (x + 1)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.75cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 13:11. What fraction of the counters are white?
Answer: 11⁄24 -
5. Statistics Mean
Calculate the mean of: 38, 12, 24, 43, 35, 34, 34. Give your answer to 2 decimal places
Answer: 31.43