Keystones — Capstone
Five GCSE retrieval questions · 18 August 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 9√4 - 4√4
Answer: 5√4 -
2. Algebra Quadratic from a turning point
Find equation with turning point (2, 10) and coefficient 6
Answer: y = 6(x - 2)² + 10 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 16cm, angle = 39°
Answer: 49.6cm -
4. Ratio One amount as a percentage of another
36 out of 93 students passed. What percentage passed?
Answer: 38.7% -
5. Statistics Simple probability
A spinner has 6 red, 6 blue and 6 green sections. Probability of landing on red?
Answer: 1⁄3