Keystones — Lintel
Five GCSE retrieval questions · 6 May 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 48 + ? = 135
Answer: 87 -
2. Algebra
Factorise fully: 18x² + 15x
Answer: 3x(6x + 5) -
3. Geometry
Calculate the distance between (10, 6) and (13, 10)
Answer: 5 -
4. Ratio
Simplify the ratio 5m:500cm
Answer: 1:100 -
5. Statistics
A bag has 6 red and 5 blue balls. What is the probability of picking a red ball?
Answer: 6⁄11