Keystones — Lintel
Five GCSE retrieval questions · 14 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 420,000 in standard form
Answer: 4.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 90
Answer: (x + 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.05cm -
4. Ratio Mixed ratio problems
In ratio 5:12:7, what fraction is the first part?
Answer: 5⁄24 -
5. Statistics Mean
Calculate the mean of: 31, 16, 42, 6, 37, 32. Give your answer to 2 decimal places
Answer: 27.33