Keystones — Lintel
Five GCSE retrieval questions · 11 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000082 in standard form
Answer: 8.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x - 11
Answer: (x + 1)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 60°. Find adjacent side
Answer: 16.5cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 2:2:10. What fraction of the beads are red?
Answer: 1⁄7 -
5. Statistics Mean
Calculate the mean of: 14, 9, 28, 26, 46, 7, 34. Give your answer to 2 decimal places
Answer: 23.43