Keystones — Lintel
Five GCSE retrieval questions · 18 June 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
4700000
Answer: 4.7 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 28°. Find adjacent side
Answer: 30cm -
4. Ratio Mixed ratio problems
In ratio 1:3:3, what fraction is the second part?
Answer: 3⁄7 -
5. Statistics Mean
The mean of 6 numbers is 21. If 5 of them are 30, 31, 19, 37, 34, what is the missing number?
Answer: -25