Keystones — Lintel
Five GCSE retrieval questions · 24 August 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
5400000
Answer: 5.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 26°. Find adjacent side
Answer: 34.2cm -
4. Ratio Mixed ratio problems
Simplify: 15:15:9
Answer: 5:5:3 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 42, 22, 42, 39, 17, what is the missing number?
Answer: 78