Keystones — Lintel
Five GCSE retrieval questions · 2 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 930,000,000 in standard form
Answer: 9.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 9.01cm -
4. Ratio Mixed ratio problems
In ratio 6:9:12, what fraction is the third part?
Answer: 4⁄9 -
5. Statistics Mean
Calculate the mean of: 41, 39, 50, 19, 45, 23, 49
Answer: 38