Keystones — Capstone
Five GCSE retrieval questions · 26 May 2026 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 120. What are the numbers?
Answer: 39, 40, and 41 -
2. Algebra
Factorise fully: 18x² + 15x
Answer: 3x(6x + 5) -
3. Geometry
Adjacent = 16cm, hypotenuse = 26cm. Find the angle
Answer: 52° -
4. Ratio
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics
The mean of 5 numbers is 26. If 4 of them are 28, 36, 34, 16, what is the missing number?
Answer: 16