Keystones — Capstone
Five GCSE retrieval questions · 11 October 2026
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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 (1, 6) and coefficient 3
Answer: y = 3(x - 1)² + 6 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 22cm, angle = 33°
Answer: 62.5cm -
4. Ratio One amount as a percentage of another
42 out of 77 students passed. What percentage passed?
Answer: 54.5% -
5. Statistics Simple probability
A spinner has 5 red, 6 blue and 2 green sections. Probability of landing on red?
Answer: 5⁄13