Keystones — Lintel
Five GCSE retrieval questions · 18 June 2025 · mathsvault.uk/keystones
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1. Number
0.0048
Answer: 4.8 × 10^-3 -
2. Algebra
Factorise fully: 10x² + 30x
Answer: 5x(2x + 6) -
3. Geometry
Adjacent = 12cm, hypotenuse = 28cm. Find the angle
Answer: 64.6° -
4. Ratio
Simplify: 6:6:4
Answer: 3:3:2 -
5. Statistics
A bag has 7 red and 7 blue balls. What is the probability of picking a red ball?
Answer: 1⁄2