Keystones — Lintel
Five GCSE retrieval questions · 25 March 2026 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 141. What are the numbers?
Answer: 46, 47, and 48 -
2. Algebra
Factorise fully: 6x² + 6x
Answer: 3x(2x + 2) -
3. Geometry
Adjacent = 21cm, hypotenuse = 29cm. Find the angle
Answer: 43.6° -
4. Ratio
Simplify: 10:6:10
Answer: 5:3:5 -
5. Statistics
Calculate the mean of: 33, 31, 20, 18, 11, 7, 7, 18
Answer: 18.1