Keystones — Capstone
Five GCSE retrieval questions · 10 October 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 6√5 - 5√5
Answer: 1√5 -
2. Algebra Quadratic from a turning point
Find equation with turning point (1, 8) and coefficient 6
Answer: y = 6(x - 1)² + 8 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 24cm, angle = 43°
Answer: 79.2cm -
4. Ratio One amount as a percentage of another
41 out of 99 students passed. What percentage passed?
Answer: 41.4% -
5. Statistics Simple probability
A spinner has 6 red, 6 blue and 2 green sections. Probability of landing on red?
Answer: 3⁄7