Keystones — Lintel
Five GCSE retrieval questions · 2 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0056 in standard form
Answer: 5.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 9
Answer: (x + 9)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 8.66cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 13:15. What fraction of the marbles are black?
Answer: 13⁄28 -
5. Statistics Mean
Calculate the mean of: 22, 16, 50, 5, 5, 16, 47
Answer: 23