Keystones — Lintel
Five GCSE retrieval questions · 8 March 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 38 + ? = 107
Answer: 69 -
2. Algebra
What is the next term? 4, 12, 36, 108, ...
Answer: 324 -
3. Geometry
Adjacent = 21cm, hypotenuse = 26cm. Find the angle
Answer: 36.1° -
4. Ratio
Simplify: 24:16:24
Answer: 3:2:3 -
5. Statistics
A bag has 5 red and 6 blue balls. What is the probability of picking a red ball?
Answer: 5⁄11