Keystones — Capstone
Five GCSE retrieval questions · 12 May 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 11√3 - 7√3
Answer: 4√3 -
2. Algebra Quadratic from a turning point
Find equation with turning point (1, 3) and coefficient 6
Answer: y = 6(x - 1)² + 3 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 20cm, angle = 31°
Answer: 55.3cm -
4. Ratio One amount as a percentage of another
40 out of 72 students passed. What percentage passed?
Answer: 55.6% -
5. Statistics Simple probability
A spinner has 3 red, 4 blue and 6 green sections. Probability of landing on red?
Answer: 3⁄13