Keystones — Capstone
Five GCSE retrieval questions · 6 October 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 8√5 - 3√5
Answer: 5√5 -
2. Algebra Quadratic from a turning point
Find equation with turning point (5, 10) and coefficient 4
Answer: y = 4(x - 5)² + 10 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 17cm, angle = 35°
Answer: 49.7cm -
4. Ratio One amount as a percentage of another
48 out of 95 students passed. What percentage passed?
Answer: 50.5% -
5. Statistics Simple probability
A spinner has 4 red, 4 blue and 6 green sections. Probability of landing on red?
Answer: 2⁄7