Keystones — Lintel
Five GCSE retrieval questions · 8 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000092 in standard form
Answer: 9.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 22.67cm -
4. Ratio Mixed ratio problems
In ratio 10:1:12, what fraction is the first part?
Answer: 10⁄23 -
5. Statistics Mean
Calculate the mean of: 46, 7, 20, 38, 14, 41, 7, 7
Answer: 22.5