Keystones — Lintel
Five GCSE retrieval questions · 10 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000015 in standard form
Answer: 1.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 22.66cm -
4. Ratio Mixed ratio problems
In ratio 10:4:11, what fraction is the first part?
Answer: 2⁄5 -
5. Statistics Mean
Calculate the mean of: 42, 36, 17, 11, 40, 25
Answer: 28.5