Keystones — Capstone
Five GCSE retrieval questions · 16 May 2026 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 147. What are the numbers?
Answer: 48, 49, and 50 -
2. Algebra
Expand: 6(5x - 10)
Answer: 30x - 60 -
3. Geometry
Adjacent = 18cm, hypotenuse = 33cm. Find the angle
Answer: 56.9° -
4. Ratio
Calculate 32.5% of 442
Answer: 143.65 -
5. Statistics
The mean of 6 numbers is 28. If 5 of them are 40, 20, 40, 20, 18, what is the missing number?
Answer: 30