Keystones — Lintel
Five GCSE retrieval questions · 13 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00065 in standard form
Answer: 6.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 12.87cm -
4. Ratio Mixed ratio problems
Black and white counters are in the ratio 10:3. What fraction of the counters are black?
Answer: 10⁄13 -
5. Statistics Mean
Calculate the mean of: 40, 48, 25, 50, 6, 8
Answer: 29.5