Keystones — Lintel
Five GCSE retrieval questions · 24 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00011 in standard form
Answer: 1.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 56
Answer: (x + 7)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 27.14cm -
4. Ratio Mixed ratio problems
In ratio 5:11:11, what fraction is the second part?
Answer: 11⁄27 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 41, 22, 17, 48, what is the missing number?
Answer: 47