Keystones — Lintel
Five GCSE retrieval questions · 20 November 2025 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 144. What are the numbers?
Answer: 47, 48, and 49 -
2. Algebra
Factorise fully: 4x² + 4x
Answer: 2x(2x + 2) -
3. Geometry
Calculate the perimeter of a right triangle with sides 7cm and 6cm
Answer: 22.2cm -
4. Ratio
Find 16% of 269
Answer: 43.04 -
5. Statistics
Find the range of: -1, 27, -6, -17, -27
Answer: 54