Keystones — Lintel
Five GCSE retrieval questions · 14 January 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 89 + ? = 133
Answer: 44 -
2. Algebra
Solve: 2x = 8
Answer: x = 4 -
3. Geometry
Find c if a = 16cm and b = 25cm in a right triangle
Answer: 29.7cm -
4. Ratio
Simplify the ratio 5m:500cm
Answer: 1:100 -
5. Statistics
Calculate the mean of: 8, 45, 49, 14, 24, 9, 16, 25
Answer: 23.8