Keystones — Capstone
Five GCSE retrieval questions · 28 March 2026 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 117. What are the numbers?
Answer: 38, 39, and 40 -
2. Algebra
Factorise fully: 12x² + 21x
Answer: 3x(4x + 7) -
3. Geometry
Adjacent = 29cm, hypotenuse = 42cm. Find the angle
Answer: 46.3° -
4. Ratio
Simplify the ratio 6m:600cm
Answer: 1:100 -
5. Statistics
The mean of 5 numbers is 37. If 4 of them are 30, 36, 17, 48, what is the missing number?
Answer: 54