Keystones — Lintel
Five GCSE retrieval questions · 6 October 2025 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 138. What are the numbers?
Answer: 45, 46, and 47 -
2. Algebra
Find the next term: 1, 4, 10, 19, ...
Answer: 31 -
3. Geometry
Adjacent = 17cm, hypotenuse = 25cm. Find the angle
Answer: 47.2° -
4. Ratio
Find 60% of 344
Answer: 206.4 -
5. Statistics
A bag has 8 red and 4 blue balls. What is the probability of picking a red ball?
Answer: 2⁄3