Keystones — Lintel
Five GCSE retrieval questions · 29 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 420,000,000 in standard form
Answer: 4.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 45°. Find opposite
Answer: 25cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 4:9. What fraction of the marbles are black?
Answer: 4⁄13 -
5. Statistics Mean
Calculate the mean of: 47, 43, 11, 25, 27, 42, 43
Answer: 34