Keystones — Lintel
Five GCSE retrieval questions · 9 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 24,000,000 in standard form
Answer: 2.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 16.64cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 14:12. What fraction of the counters are black?
Answer: 7⁄13 -
5. Statistics Mean
Calculate the mean of: 39, 32, 6, 48, 28, 36, 36, 11
Answer: 29.5