Keystones — Capstone
Five GCSE retrieval questions · 9 December 2025 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 90. What are the numbers?
Answer: 29, 30, and 31 -
2. Algebra
Factorise fully: 4x² + 8x
Answer: 2x(2x + 4) -
3. Geometry
Adjacent = 24cm, hypotenuse = 43cm. Find the angle
Answer: 56.1° -
4. Ratio
Calculate 12.6% of 908
Answer: 114.41 -
5. Statistics
The mean of 5 numbers is 30. If 4 of them are 38, 35, 47, 46, what is the missing number?
Answer: -16