Keystones — Lintel
Five GCSE retrieval questions · 15 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.086 in standard form
Answer: 8.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 40
Answer: (x + 4)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 63°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.89cm -
4. Ratio Mixed ratio problems
In ratio 11:3:1, what fraction is the third part?
Answer: 1⁄15 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 29, 47, 43, what is the missing number?
Answer: 37