Keystones — Capstone
Five GCSE retrieval questions · 29 March 2026 · mathsvault.uk/keystones
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1. Number Adding and subtracting surds
Simplify: 7√2 - 3√2
Answer: 4√2 -
2. Algebra Quadratic from a turning point
Find equation with turning point (1, 8) and coefficient 5
Answer: y = 5(x - 1)² + 8 -
3. Geometry Trigonometry — perimeter
Find perimeter: adjacent = 15cm, angle = 53°
Answer: 59.8cm -
4. Ratio One amount as a percentage of another
48 out of 100 students passed. What percentage passed?
Answer: 48% -
5. Statistics Simple probability
A spinner has 6 red, 4 blue and 4 green sections. Probability of landing on red?
Answer: 3⁄7