Keystones — Capstone
Five GCSE retrieval questions · 16 November 2025 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 123. What are the numbers?
Answer: 40, 41, and 42 -
2. Algebra
Factorise fully: 6x² + 21x
Answer: 3x(2x + 7) -
3. Geometry
Adjacent = 25cm, hypotenuse = 38cm. Find the angle
Answer: 48.9° -
4. Ratio
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics
A spinner has 5 red, 5 blue and 3 green sections. Probability of landing on red?
Answer: 5⁄13