Keystones — Lintel
Five GCSE retrieval questions · 22 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.062 in standard form
Answer: 6.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 32
Answer: (x + 4)(x - 8) -
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 7:12:10, what fraction is the second part?
Answer: 12⁄29 -
5. Statistics Mean
Calculate the mean of: 46, 14, 41, 47, 47, 48, 21. Give your answer to 2 decimal places
Answer: 37.71