Keystones — Cornerstone
Five GCSE retrieval questions · 29 November 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 750 + 861
Answer: 750 + 861 = 1611 -
2. Algebra
Expand: 5(6x + 5)
Answer: 30x + 25 -
3. Geometry
Calculate the area of a circle with diameter 23cm
Answer: 415.48cm² -
4. Ratio
Simplify the ratio 16:6
Answer: 8:3 -
5. Statistics
A bag has 4 red and 6 blue balls. What is the probability of picking a red ball?
Answer: 2⁄5