Keystones — Capstone
Five GCSE retrieval questions · 22 October 2025 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 141. What are the numbers?
Answer: 46, 47, and 48 -
2. Algebra
Complete the square: x² + 2.2x
Answer: (x + 1.1)² - 1.21 -
3. Geometry
Adjacent = 15cm, hypotenuse = 21cm. Find the angle
Answer: 44.4° -
4. Ratio
Simplify the ratio 7m:700cm
Answer: 1:100 -
5. Statistics
The mean of 5 numbers is 38. If 4 of them are 39, 28, 45, 15, what is the missing number?
Answer: 63