Keystones — Lintel
Five GCSE retrieval questions · 25 August 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 87 + ? = 160
Answer: 73 -
2. Algebra
Factorise: 9x² + 7x
Answer: x(9x + 7) -
3. Geometry
Adjacent = 27cm, hypotenuse = 47cm. Find the angle
Answer: 54.9° -
4. Ratio
Simplify: 9:9:12
Answer: 3:3:4 -
5. Statistics
Calculate the mean of: 50, 13, 38, 38, 45, 19, 13, 14
Answer: 28.8