Keystones — Lintel
Five GCSE retrieval questions · 4 March 2026 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 150. What are the numbers?
Answer: 49, 50, and 51 -
2. Algebra
Factorise: 5x² + 5x
Answer: 5x(x + 1) -
3. Geometry
Calculate the hypotenuse when a = 12cm and b = 14cm
Answer: 18.44cm -
4. Ratio
Simplify: 8:12:10
Answer: 4:6:5 -
5. Statistics
Calculate the mean of: 34, 19, 16, 5, 32, 18
Answer: 20.7