Keystones — Lintel
Five GCSE retrieval questions · 20 January 2026 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 144. What are the numbers?
Answer: 47, 48, and 49 -
2. Algebra
Solve: 3x + 7 = x - 5
Answer: x = 6 -
3. Geometry
Calculate perimeter: two sides are 12cm and 6cm at right angles
Answer: 31.4cm -
4. Ratio
Simplify the ratio 6m:600cm
Answer: 1:100 -
5. Statistics
A bag has 5 red and 3 blue balls. What is the probability of picking a red ball?
Answer: 5⁄8