Keystones — Lintel
Five GCSE retrieval questions · 9 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000061 in standard form
Answer: 6.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 15.62cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 10:8. What fraction of the counters are black?
Answer: 5⁄9 -
5. Statistics Mean
Calculate the mean of: 48, 15, 32, 25, 17, 28
Answer: 27.5