Keystones — Lintel
Five GCSE retrieval questions · 26 May 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
9800000
Answer: 9.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 52°. Find adjacent side
Answer: 14.2cm -
4. Ratio Mixed ratio problems
In ratio 2:3:3, what fraction is the second part?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 34, 34, 49, what is the missing number?
Answer: 35