Keystones — Capstone
Five GCSE retrieval questions · 22 August 2026 · mathsvault.uk/keystones
-
1. Number Adding and subtracting surds
Simplify: 10√2 - 3√2
Answer: 7√2 -
2. Algebra Quadratic from a turning point
Find equation with turning point (5, 9) and coefficient 4
Answer: y = 4(x - 5)² + 9 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 24cm, angle = 50°
Answer: 89.9cm -
4. Ratio One amount as a percentage of another
42 out of 98 students passed. What percentage passed?
Answer: 42.9% -
5. Statistics Simple probability
A spinner has 6 red, 2 blue and 4 green sections. Probability of landing on red?
Answer: 1⁄2