Keystones — Lintel
Five GCSE retrieval questions · 5 May 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 999 + 640
Answer: 1639 -
2. Algebra
Solve: x⁄5 = 1.8
Answer: x = 9 -
3. Geometry
Adjacent = 16cm, hypotenuse = 36cm. Find the angle
Answer: 63.6° -
4. Ratio
Simplify the ratio 5m:500cm
Answer: 1:100 -
5. Statistics
A bag has 5 red and 5 blue balls. What is the probability of picking a red ball?
Answer: 1⁄2