Keystones — Capstone
Five GCSE retrieval questions · 23 March 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 12√5 - 3√5
Answer: 9√5 -
2. Algebra Quadratic from a turning point
Find equation with turning point (4, 9) and coefficient 3
Answer: y = 3(x - 4)² + 9 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 24cm, angle = 32°
Answer: 67.3cm -
4. Ratio One amount as a percentage of another
49 out of 72 students passed. What percentage passed?
Answer: 68.1% -
5. Statistics Simple probability
A spinner has 6 red, 3 blue and 6 green sections. Probability of landing on red?
Answer: 2⁄5