Keystones — Lintel
Five GCSE retrieval questions · 30 September 2025 · 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: 6x² + 18x
Answer: 3x(2x + 6) -
3. Geometry
Adjacent = 21cm, hypotenuse = 31cm. Find the angle
Answer: 47.4° -
4. Ratio
Calculate 17.3% of 268
Answer: 46.36 -
5. Statistics
A bag has 3 red and 3 blue balls. What is the probability of picking a red ball?
Answer: 1⁄2