Keystones — Lintel
Five GCSE retrieval questions · 21 January 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 91 + ? = 143
Answer: 52 -
2. Algebra
Factorise: 7x² + 2x
Answer: x(7x + 2) -
3. Geometry
Adjacent = 26cm, hypotenuse = 33cm. Find the angle
Answer: 38° -
4. Ratio
Calculate 30.9% of 830
Answer: 256.47 -
5. Statistics
Find the range of: -8, 45, 9, -14, 14
Answer: 59