Keystones — Lintel
Five GCSE retrieval questions · 27 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 850,000,000 in standard form
Answer: 8.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 27
Answer: (x + 3)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 40°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.58cm -
4. Ratio Mixed ratio problems
Simplify: 18:6:6
Answer: 3:1:1 -
5. Statistics Mean
Calculate the mean of: 24, 22, 49, 21, 17, 17, 6. Give your answer to 2 decimal places
Answer: 22.29