Keystones — Lintel
Five GCSE retrieval questions · 26 June 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00039
Answer: 3.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 8
Answer: (x - 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 50°. Find adjacent side
Answer: 16.cm -
4. Ratio Mixed ratio problems
In ratio 1:1:2, what fraction is the second part?
Answer: 1⁄4 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 46, 32, 20, 28, what is the missing number?
Answer: 29