Keystones — Capstone
Five GCSE retrieval questions · 24 March 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 12√3 - 11√3
Answer: 1√3 -
2. Algebra Quadratic from a turning point
Find equation with turning point (1, 4) and coefficient 6
Answer: y = 6(x - 1)² + 4 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 22cm, angle = 51°
Answer: 84.2cm -
4. Ratio One amount as a percentage of another
44 out of 77 students passed. What percentage passed?
Answer: 57.1% -
5. Statistics Simple probability
A spinner has 3 red, 3 blue and 4 green sections. Probability of landing on red?
Answer: 3⁄10