Keystones — Lintel
Five GCSE retrieval questions · 31 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0089 in standard form
Answer: 8.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.71cm -
4. Ratio Mixed ratio problems
Simplify: 15:12:9
Answer: 5:4:3 -
5. Statistics Mean
Calculate the mean of: 46, 38, 31, 22, 32, 13, 42
Answer: 32