Keystones — Lintel
Five GCSE retrieval questions · 12 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0098 in standard form
Answer: 9.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 45
Answer: (x + 9)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 15.92cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 13:9. What fraction of the marbles are orange?
Answer: 13⁄22 -
5. Statistics Mean
Calculate the mean of: 30, 44, 35, 30, 10, 50, 12, 15
Answer: 28.25