Keystones — Lintel
Five GCSE retrieval questions · 12 December 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 993 + 883
Answer: 1876 -
2. Algebra
Factorise fully: 35x² + 10x
Answer: 5x(7x + 2) -
3. Geometry
Find perimeter: adjacent = 16cm, angle = 38°
Answer: 48.8cm -
4. Ratio
Find 47% of 346
Answer: 162.62 -
5. Statistics
Find the range of: -25, -3, 23, 21, -19
Answer: 48