Keystones — Lintel
Five GCSE retrieval questions · 11 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0081 in standard form
Answer: 8.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.92cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 9:9:1. What fraction of the sweets are orange?
Answer: 9⁄19 -
5. Statistics Mean
Calculate the mean of: 13, 10, 50, 27, 21, 15, 33. Give your answer to 2 decimal places
Answer: 24.14