Keystones — Lintel
Five GCSE retrieval questions · 24 June 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.09
Answer: 9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 25
Answer: (x - 5)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 55°. Find adjacent side
Answer: 9.2cm -
4. Ratio Mixed ratio problems
In ratio 2:4:2, what fraction is the second part?
Answer: 4⁄8 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 34, 39, 15, 22, 19, what is the missing number?
Answer: 3