Keystones — Capstone
Five GCSE retrieval questions · 17 May 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 5√5 - 3√5
Answer: 2√5 -
2. Algebra Quadratic from a turning point
Find equation with turning point (5, 5) and coefficient 2
Answer: y = 2(x - 5)² + 5 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 19cm, angle = 50°
Answer: 71.2cm -
4. Ratio One amount as a percentage of another
48 out of 76 students passed. What percentage passed?
Answer: 63.2% -
5. Statistics Simple probability
A spinner has 4 red, 3 blue and 6 green sections. Probability of landing on red?
Answer: 4⁄13