Keystones — Lintel
Five GCSE retrieval questions · 4 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 250,000,000 in standard form
Answer: 2.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 31°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.71cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 hours : 50 minutes
Answer: 12:5 -
5. Statistics Mean
Calculate the mean of: 12, 47, 26, 5, 49, 44, 19, 35. Give your answer to 2 decimal places
Answer: 29.63