Keystones — Capstone
Five GCSE retrieval questions · 19 April 2025 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 90. What are the numbers?
Answer: 29, 30, and 31 -
2. Algebra
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry
Adjacent = 25cm, hypotenuse = 42cm. Find the angle
Answer: 53.5° -
4. Ratio
Simplify the ratio 6m:600cm
Answer: 1:100 -
5. Statistics
The mean of 6 numbers is 37. If 5 of them are 21, 46, 19, 27, 18, what is the missing number?
Answer: 91