Keystones — Lintel
Five GCSE retrieval questions · 1 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 20,000 in standard form
Answer: 2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 13.8cm -
4. Ratio Mixed ratio problems
Red, blue and green marbles are in the ratio 12:6:5. What fraction of the marbles are blue?
Answer: 6⁄23 -
5. Statistics Mean
Calculate the mean of: 12, 35, 26, 42, 25, 23. Give your answer to 2 decimal places
Answer: 27.17