Keystones — Lintel
Five GCSE retrieval questions · 15 April 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 360,000,000 in standard form
Answer: 3.6 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 50
Answer: (x + 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.74cm -
4. Ratio Mixed ratio problems
In ratio 11:3:5, what fraction is the third part?
Answer: 5⁄19 -
5. Statistics Mean
The mean of 6 numbers is 27. If 5 of them are 26, 19, 48, 18, 45, what is the missing number?
Answer: 6