Keystones — Lintel
Five GCSE retrieval questions · 13 November 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 40 + ? = 121
Answer: 81 -
2. Algebra
Collect like terms: 3x + 8y + 2x + 8y
Answer: 5x + 16y -
3. Geometry
Find the perimeter: hypotenuse = 19cm, one side = 11cm
Answer: 45.5cm -
4. Ratio
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics
Calculate the mean of: 7, 19, 15, 8, 10, 28
Answer: 14.5