Keystones — Lintel
Five GCSE retrieval questions · 21 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 2,200,000 in standard form
Answer: 2.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 24
Answer: (x + 3)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 30.72cm -
4. Ratio Mixed ratio problems
In ratio 11:4:10, what fraction is the first part?
Answer: 11⁄25 -
5. Statistics Mean
Calculate the mean of: 12, 30, 35, 18, 32, 11
Answer: 23