Keystones — Lintel
Five GCSE retrieval questions · 6 October 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0041
Answer: 4.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 51°. Find adjacent side
Answer: 18.3cm -
4. Ratio Mixed ratio problems
In ratio 3:1:3, what fraction is the second part?
Answer: 1⁄7 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 32, 49, 19, 32, what is the missing number?
Answer: 38