Keystones — Lintel
Five GCSE retrieval questions · 20 May 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 89 + ? = 163
Answer: 74 -
2. Algebra
Factorise: 2x² + 7x
Answer: x(2x + 7) -
3. Geometry
Adjacent = 28cm, hypotenuse = 38cm. Find the angle
Answer: 42.5° -
4. Ratio
Simplify: 16:12:20
Answer: 4:3:5 -
5. Statistics
Find the range of: 37, -27, 34, -8, 27
Answer: 64