Keystones — Lintel
Five GCSE retrieval questions · 12 November 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
30000
Answer: 3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 30°. Find adjacent side
Answer: 24.2cm -
4. Ratio Mixed ratio problems
£312.00 is shared between A and B in the ratio 3:5. How much does A receive?
Answer: £117.00 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 28, 22, 48, 36, 41, what is the missing number?
Answer: 11