Keystones — Lintel
Five GCSE retrieval questions · 19 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 41,000,000 in standard form
Answer: 4.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.32cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 14:7. What fraction of the marbles are blue?
Answer: 1⁄3 -
5. Statistics Mean
Calculate the mean of: 35, 47, 29, 34, 38, 12, 9. Give your answer to 2 decimal places
Answer: 29.14