Keystones — Lintel
Five GCSE retrieval questions · 8 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0023 in standard form
Answer: 2.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 40
Answer: (x + 4)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.65cm -
4. Ratio Mixed ratio problems
In ratio 7:12:8, what fraction is the third part?
Answer: 8⁄27 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 37, 20, 38, 17, what is the missing number?
Answer: 43