Keystones — Lintel
Five GCSE retrieval questions · 7 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 81,000 in standard form
Answer: 8.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.93cm -
4. Ratio Mixed ratio problems
In ratio 7:8:11, what fraction is the first part?
Answer: 7⁄26 -
5. Statistics Mean
Calculate the mean of: 46, 35, 15, 17, 24, 6. Give your answer to 2 decimal places
Answer: 23.83