Keystones — Lintel
Five GCSE retrieval questions · 9 September 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0063 in standard form
Answer: 6.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 54
Answer: (x + 6)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 15.31cm -
4. Ratio Mixed ratio problems
In ratio 3:6:8, what fraction is the third part?
Answer: 8⁄17 -
5. Statistics Mean
Calculate the mean of: 40, 11, 10, 22, 6, 15, 9, 38. Give your answer to 2 decimal places
Answer: 18.88