Keystones — Capstone
Five GCSE retrieval questions · 20 March 2026 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 126. What are the numbers?
Answer: 41, 42, and 43 -
2. Algebra
Factorise fully: 12x² + 8x
Answer: 4x(3x + 2) -
3. Geometry
Find c if a = 9cm and b = 13cm in a right triangle
Answer: 15.8cm -
4. Ratio
Simplify the ratio 6m:600cm
Answer: 1:100 -
5. Statistics
The mean of 5 numbers is 35. If 4 of them are 33, 28, 22, 15, what is the missing number?
Answer: 77