Keystones — Capstone
Five GCSE retrieval questions · 5 October 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 5√2 - 3√2
Answer: 2√2 -
2. Algebra Quadratic from a turning point
Find equation with turning point (1, 2) and coefficient 3
Answer: y = 3(x - 1)² + 2 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 14cm, angle = 41°
Answer: 44.8cm -
4. Ratio One amount as a percentage of another
53 out of 100 students passed. What percentage passed?
Answer: 53% -
5. Statistics Simple probability
A spinner has 3 red, 3 blue and 4 green sections. Probability of landing on red?
Answer: 3⁄10