Keystones — Lintel
Five GCSE retrieval questions · 6 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 96,000,000 in standard form
Answer: 9.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 40
Answer: (x + 10)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 25.03cm -
4. Ratio Mixed ratio problems
In ratio 2:12:6, what fraction is the first part?
Answer: 1⁄10 -
5. Statistics Mean
Calculate the mean of: 41, 40, 37, 38, 24, 11, 49, 12
Answer: 31.5