Keystones — Lintel
Five GCSE retrieval questions · 22 March 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 98 + ? = 153
Answer: 55 -
2. Algebra
Factorise fully: 16x² + 20x
Answer: 4x(4x + 5) -
3. Geometry
Opposite = 14cm, adjacent = 12cm. Calculate the angle
Answer: 49.4° -
4. Ratio
Simplify: 10:12:6
Answer: 5:6:3 -
5. Statistics
A bag has 5 red and 4 blue balls. What is the probability of picking a red ball?
Answer: 5⁄9