Keystones — Capstone
Five GCSE retrieval questions · 23 August 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 (5, 8) and coefficient 6
Answer: y = 6(x - 5)² + 8 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 11cm, angle = 48°
Answer: 39.6cm -
4. Ratio One amount as a percentage of another
47 out of 85 students passed. What percentage passed?
Answer: 55.3% -
5. Statistics Simple probability
A spinner has 5 red, 4 blue and 3 green sections. Probability of landing on red?
Answer: 5⁄12