Keystones — Lintel
Five GCSE retrieval questions · 21 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000021 in standard form
Answer: 2.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 11.25cm -
4. Ratio Mixed ratio problems
In ratio 4:6:2, what fraction is the third part?
Answer: 1⁄6 -
5. Statistics Mean
Calculate the mean of: 6, 20, 19, 10, 44, 10. Give your answer to 2 decimal places
Answer: 18.17