Keystones — Lintel
Five GCSE retrieval questions · 27 February 2026 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 135. What are the numbers?
Answer: 44, 45, and 46 -
2. Algebra
Factorise fully: 20x² + 35x
Answer: 5x(4x + 7) -
3. Geometry
Find perimeter: adjacent = 12cm, angle = 43°
Answer: 39.6cm -
4. Ratio
Simplify the ratio 7m:700cm
Answer: 1:100 -
5. Statistics
A spinner has 2 red, 4 blue and 5 green sections. Probability of landing on red?
Answer: 2⁄11