Keystones — Lintel
Five GCSE retrieval questions · 13 February 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 52 + ? = 143
Answer: 91 -
2. Algebra
Factorise: 4x² + 2x
Answer: 2x(2x + 1) -
3. Geometry
Opposite = 19cm, adjacent = 11cm. Calculate the angle
Answer: 59.9° -
4. Ratio
Simplify the ratio 3m:300cm
Answer: 1:100 -
5. Statistics
Find the range of: 29, -24, -17, 40, 24
Answer: 64