Keystones — Capstone
Five GCSE retrieval questions · 11 May 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: √8 + √18
Answer: 2√2 + 3√2 = 5√2 -
2. Algebra Quadratic from a turning point
Find equation with turning point (2, 9) and coefficient 6
Answer: y = 6(x - 2)² + 9 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 21cm, angle = 50°
Answer: 78.7cm -
4. Ratio One amount as a percentage of another
55 out of 88 students passed. What percentage passed?
Answer: 62.5% -
5. Statistics Simple probability
A spinner has 6 red, 2 blue and 6 green sections. Probability of landing on red?
Answer: 3⁄7