Keystones — Lintel
Five GCSE retrieval questions · 29 March 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 82,000,000 in standard form
Answer: 8.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 8
Answer: (x + 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.62cm -
4. Ratio Mixed ratio problems
Black, white and yellow beads are in the ratio 9:2:9. What fraction of the beads are black?
Answer: 9⁄20 -
5. Statistics Mean
Calculate the mean of: 38, 20, 25, 15, 36, 17, 26. Give your answer to 2 decimal places
Answer: 25.29