Keystones — Lintel
Five GCSE retrieval questions · 27 February 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 74 + ? = 126
Answer: 52 -
2. Algebra
Factorise fully: 14x² + 10x
Answer: 2x(7x + 5) -
3. Geometry
Calculate the area of a circle with diameter 23cm
Answer: 415.48cm² -
4. Ratio
Simplify: 16:24:12
Answer: 4:6:3 -
5. Statistics
A bag has 4 red and 6 blue balls. What is the probability of picking a red ball?
Answer: 2⁄5