Keystones — Lintel
Five GCSE retrieval questions · 13 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 14,000 in standard form
Answer: 1.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 56
Answer: (x + 7)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 14.43cm -
4. Ratio Mixed ratio problems
Black and white marbles are in the ratio 3:10. What fraction of the marbles are black?
Answer: 3⁄13 -
5. Statistics Mean
Calculate the mean of: 5, 20, 19, 6, 25, 36
Answer: 18.5