Keystones — Capstone
Five GCSE retrieval questions · 26 November 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
Factorise fully: 10x² + 25x
Answer: 5x(2x + 5) -
3. Geometry
Adjacent = 16cm, hypotenuse = 23cm. Find the angle
Answer: 45.9° -
4. Ratio
Calculate 28.6% of 602
Answer: 172.17 -
5. Statistics
The mean of 5 numbers is 26. If 4 of them are 28, 21, 33, 37, what is the missing number?
Answer: 11