Keystones — Lintel
Five GCSE retrieval questions · 15 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 780,000,000 in standard form
Answer: 7.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.79cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 14:9. What fraction of the marbles are orange?
Answer: 14⁄23 -
5. Statistics Mean
Calculate the mean of: 35, 20, 19, 29, 8, 5, 45
Answer: 23