Keystones — Lintel
Five GCSE retrieval questions · 10 December 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 1⁄4 + 1⁄2 + 2⁄4
Answer: 5⁄4 -
2. Algebra
Factorise: 4x² + 2x
Answer: 2x(2x + 1) -
3. Geometry
Adjacent = 28cm, hypotenuse = 47cm. Find the angle
Answer: 53.4° -
4. Ratio
Find 27% of 374
Answer: 100.98 -
5. Statistics
A bag has 3 red and 7 blue balls. What is the probability of picking a red ball?
Answer: 3⁄10