Keystones — Lintel
Five GCSE retrieval questions · 12 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 960,000,000 in standard form
Answer: 9.6 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 15
Answer: (x + 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 17.11cm -
4. Ratio Mixed ratio problems
In ratio 1:4:8, what fraction is the first part?
Answer: 1⁄13 -
5. Statistics Mean
Calculate the mean of: 7, 8, 39, 49, 26, 17, 39. Give your answer to 2 decimal places
Answer: 26.43