Keystones — Lintel
Five GCSE retrieval questions · 9 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00029 in standard form
Answer: 2.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 84
Answer: (x + 12)(x + 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.99cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 11:3. What fraction of the marbles are red?
Answer: 11⁄14 -
5. Statistics Mean
Calculate the mean of: 22, 19, 10, 20, 31, 48
Answer: 25