Keystones — Lintel
Five GCSE retrieval questions · 4 August 2025 · mathsvault.uk/keystones
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1. Number
What is ∛27?
Answer: 3 -
2. Algebra
Factorise fully: 20x² + 28x
Answer: 4x(5x + 7) -
3. Geometry
Calculate the perimeter of a right triangle with sides 9cm and 12cm
Answer: 36cm -
4. Ratio
Simplify: 4:12:4
Answer: 1:3:1 -
5. Statistics
Calculate the mean of: 44, 8, 39, 33, 17, 20, 28
Answer: 27