Keystones — Lintel
Five GCSE retrieval questions · 3 August 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00015
Answer: 1.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 42°. Find adjacent side
Answer: 16.3cm -
4. Ratio Mixed ratio problems
In ratio 4:3:2, what fraction is the second part?
Answer: 3⁄9 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 49, 32, 38, what is the missing number?
Answer: -39