Keystones — Capstone
Five GCSE retrieval questions · 3 July 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 9√5 - 2√5
Answer: 7√5 -
2. Algebra Quadratic from a turning point
Find equation with turning point (2, 10) and coefficient 5
Answer: y = 5(x - 2)² + 10 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 18cm, angle = 51°
Answer: 68.8cm -
4. Ratio One amount as a percentage of another
39 out of 93 students passed. What percentage passed?
Answer: 41.9% -
5. Statistics Simple probability
A spinner has 2 red, 4 blue and 4 green sections. Probability of landing on red?
Answer: 1⁄5