Keystones — Lintel
Five GCSE retrieval questions · 9 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 750,000 in standard form
Answer: 7.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 21x + 108
Answer: (x - 9)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 16.87cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 7:9. What fraction of the counters are white?
Answer: 9⁄16 -
5. Statistics Mean
Calculate the mean of: 32, 41, 30, 20, 12, 25, 50, 45. Give your answer to 2 decimal places
Answer: 31.88