Keystones — Lintel
Five GCSE retrieval questions · 7 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00092 in standard form
Answer: 9.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 60
Answer: (x + 6)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 42.99cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 10:11. What fraction of the marbles are red?
Answer: 10⁄21 -
5. Statistics Mean
Calculate the mean of: 32, 36, 31, 10, 11, 49, 36, 19
Answer: 28