Keystones — Lintel
Five GCSE retrieval questions · 17 March 2026 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 129. What are the numbers?
Answer: 42, 43, and 44 -
2. Algebra
Factorise fully: 25x² + 15x
Answer: 5x(5x + 3) -
3. Geometry
Adjacent = 20cm, hypotenuse = 37cm. Find the angle
Answer: 57.3° -
4. Ratio
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics
A bag has 7 red and 3 blue balls. What is the probability of picking a red ball?
Answer: 7⁄10