Keystones — Capstone
Five GCSE retrieval questions · 2 February 2026 · mathsvault.uk/keystones
-
1. Number Adding and subtracting surds
Simplify: √8 + √18
Answer: 2√2 + 3√2 = 5√2 -
2. Algebra Quadratic from a turning point
Find equation with turning point (2, 2) and coefficient 5
Answer: y = 5(x - 2)² + 2 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 11cm, angle = 40°
Answer: 34.6cm -
4. Ratio One amount as a percentage of another
55 out of 90 students passed. What percentage passed?
Answer: 61.1% -
5. Statistics Simple probability
A spinner has 5 red, 5 blue and 5 green sections. Probability of landing on red?
Answer: 1⁄3