Keystones — Capstone
Five GCSE retrieval questions · 18 December 2025 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 129. What are the numbers?
Answer: 42, 43, and 44 -
2. Algebra
Expand: 5(5x - 4)
Answer: 25x - 20 -
3. Geometry
Adjacent = 24cm, hypotenuse = 42cm. Find the angle
Answer: 55.2° -
4. Ratio
Simplify the ratio 5m:500cm
Answer: 1:100 -
5. Statistics
The mean of 5 numbers is 24. If 4 of them are 35, 20, 22, 19, what is the missing number?
Answer: 24