Keystones — Lintel
Five GCSE retrieval questions · 5 September 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
9600000
Answer: 9.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 49°. Find opposite
Answer: 18.4cm -
4. Ratio Mixed ratio problems
In ratio 1:3:2, what fraction is the second part?
Answer: 3⁄6 -
5. Statistics Mean
The mean of 6 numbers is 24. If 5 of them are 41, 22, 43, 17, 31, what is the missing number?
Answer: -10