Keystones — Lintel
Five GCSE retrieval questions · 25 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00089 in standard form
Answer: 8.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 19x + 90
Answer: (x - 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.77cm -
4. Ratio Mixed ratio problems
In ratio 5:5:9, what fraction is the first part?
Answer: 5⁄19 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 27, 25, 33, what is the missing number?
Answer: 51