Keystones — Lintel
Five GCSE retrieval questions · 3 November 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0089
Answer: 8.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 25
Answer: (x - 5)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 37°. Find adjacent side
Answer: 14.4cm -
4. Ratio Mixed ratio problems
In ratio 2:2:1, what fraction is the second part?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 19, 38, 28, what is the missing number?
Answer: 71