Keystones — Capstone
Five GCSE retrieval questions · 25 March 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 10√2 - 9√2
Answer: 1√2 -
2. Algebra Quadratic from a turning point
Find equation with turning point (5, 8) and coefficient 2
Answer: y = 2(x - 5)² + 8 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 24cm, angle = 45°
Answer: 81.9cm -
4. Ratio One amount as a percentage of another
54 out of 82 students passed. What percentage passed?
Answer: 65.9% -
5. Statistics Simple probability
A spinner has 3 red, 3 blue and 2 green sections. Probability of landing on red?
Answer: 3⁄8