Keystones — Lintel
Five GCSE retrieval questions · 16 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,900,000 in standard form
Answer: 7.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 18
Answer: (x + 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 43.21cm -
4. Ratio Mixed ratio problems
In ratio 4:10:4, what fraction is the second part?
Answer: 5⁄9 -
5. Statistics Mean
Calculate the mean of: 31, 47, 39, 7, 28, 18, 8, 41. Give your answer to 2 decimal places
Answer: 27.38