Keystones — Lintel
Five GCSE retrieval questions · 25 February 2026 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 129. What are the numbers?
Answer: 42, 43, and 44 -
2. Algebra
Solve: 7x = 21
Answer: x = 3 -
3. Geometry
Find the perimeter: hypotenuse = 22cm, one side = 13cm
Answer: 52.7cm -
4. Ratio
Calculate 35.2% of 281
Answer: 98.91 -
5. Statistics
Calculate the mean of: 35, 38, 26, 32, 6, 36, 38, 45
Answer: 32