Keystones — Lintel
Five GCSE retrieval questions · 14 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.048 in standard form
Answer: 4.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 22
Answer: (x + 2)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 27.13cm -
4. Ratio Mixed ratio problems
In ratio 12:9:3, what fraction is the second part?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 45, 32, 18, what is the missing number?
Answer: 57