Keystones — Lintel
Five GCSE retrieval questions · 22 September 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 627 + 660
Answer: 627 + 660 = 1287 -
2. Algebra
Factorise fully: 10x² + 10x
Answer: 2x(5x + 5) -
3. Geometry
Adjacent = 16cm, hypotenuse = 23cm. Find the angle
Answer: 45.9° -
4. Ratio
Simplify: 18:15:9
Answer: 6:5:3 -
5. Statistics
A spinner has 6 red, 2 blue and 4 green sections. Probability of landing on red?
Answer: 1⁄2