Keystones — Lintel
Five GCSE retrieval questions · 8 April 2026 · mathsvault.uk/keystones
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1. Number Converting to standard form
660000
Answer: 6.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 56°. Find opposite
Answer: 16.3cm -
4. Ratio Mixed ratio problems
Simplify: 18:18:9
Answer: 2:2:1 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 41, 38, 48, what is the missing number?
Answer: 33