Keystones — Lintel
Five GCSE retrieval questions · 17 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 620,000,000 in standard form
Answer: 6.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 70
Answer: (x + 7)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 22.52cm -
4. Ratio Mixed ratio problems
In ratio 2:5:12, what fraction is the first part?
Answer: 2⁄19 -
5. Statistics Mean
Calculate the mean of: 22, 45, 16, 32, 23, 16, 14
Answer: 24