Keystones — Lintel
Five GCSE retrieval questions · 19 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.048 in standard form
Answer: 4.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 15x + 50
Answer: (x - 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 61°. Find adjacent side. Give your answer to 2 decimal places
Answer: 8.73cm -
4. Ratio Mixed ratio problems
In ratio 7:4:4, what fraction is the second part?
Answer: 4⁄15 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 32, 37, 38, 20, what is the missing number?
Answer: 28