Keystones — Capstone
Five GCSE retrieval questions · 17 August 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 9√2 - 2√2
Answer: 7√2 -
2. Algebra Quadratic from a turning point
Find equation with turning point (4, 2) and coefficient 6
Answer: y = 6(x - 4)² + 2 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 21cm, angle = 32°
Answer: 58.9cm -
4. Ratio One amount as a percentage of another
52 out of 87 students passed. What percentage passed?
Answer: 59.8% -
5. Statistics Simple probability
A spinner has 4 red, 3 blue and 3 green sections. Probability of landing on red?
Answer: 2⁄5