Keystones — Lintel
Five GCSE retrieval questions · 12 October 2025 · 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
Solve: 5x - 9 = 3x + -3
Answer: x = 3 -
3. Geometry
Opposite = 12cm, adjacent = 11cm. Calculate the angle
Answer: 47.5° -
4. Ratio
Simplify: 16:16:24
Answer: 2:2:3 -
5. Statistics
A spinner has 3 red, 2 blue and 4 green sections. Probability of landing on red?
Answer: 1⁄3