Keystones — Lintel
Five GCSE retrieval questions · 12 August 2025 · mathsvault.uk/keystones
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1. Number
Add: 2⁄5 + 2⁄6
Answer: 11⁄15 -
2. Algebra
Factorise fully: 15x² + 21x
Answer: 3x(5x + 7) -
3. Geometry
Adjacent = 21cm, hypotenuse = 26cm. Find the angle
Answer: 36.1° -
4. Ratio
Find 50% of 434
Answer: 217 -
5. Statistics
A bag has 7 red and 7 blue balls. What is the probability of picking a red ball?
Answer: 1⁄2