Keystones — Capstone
Five GCSE retrieval questions · 3 October 2025 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 93. What are the numbers?
Answer: 30, 31, and 32 -
2. Algebra
Factorise fully: 8x² + 24x
Answer: 4x(2x + 6) -
3. Geometry
Adjacent = 23cm, hypotenuse = 38cm. Find the angle
Answer: 52.8° -
4. Ratio
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics
The mean of 5 numbers is 40. If 4 of them are 44, 20, 18, 35, what is the missing number?
Answer: 83