Keystones — Capstone
Five GCSE retrieval questions · 26 March 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 6√2 - 2√2
Answer: 4√2 -
2. Algebra Quadratic from a turning point
Find equation with turning point (1, 9) and coefficient 2
Answer: y = 2(x - 1)² + 9 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 13cm, angle = 56°
Answer: 55.5cm -
4. Ratio One amount as a percentage of another
39 out of 83 students passed. What percentage passed?
Answer: 47% -
5. Statistics Simple probability
A spinner has 6 red, 4 blue and 3 green sections. Probability of landing on red?
Answer: 6⁄13