Keystones — Lintel
Five GCSE retrieval questions · 24 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0068 in standard form
Answer: 6.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 32
Answer: (x + 4)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.92cm -
4. Ratio Mixed ratio problems
In ratio 6:7:6, what fraction is the third part?
Answer: 6⁄19 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 25, 22, 26, what is the missing number?
Answer: 27