Keystones — Capstone
Five GCSE retrieval questions · 10 December 2025 · mathsvault.uk/keystones
-
1. Number
The sum of three consecutive numbers is 117. What are the numbers?
Answer: 38, 39, and 40 -
2. Algebra
Complete the square: x² + 3.2x
Answer: (x + 1.6)² - 2.56 -
3. Geometry
Adjacent = 27cm, hypotenuse = 41cm. Find the angle
Answer: 48.8° -
4. Ratio
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics
The mean of 5 numbers is 20. If 4 of them are 40, 20, 18, 32, what is the missing number?
Answer: -10