Keystones — Cornerstone
Five GCSE retrieval questions · 13 November 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 77 + ? = 160
Answer: 83 -
2. Algebra
Factorise: 6x² + 6x
Answer: 6x(x + 1) -
3. Geometry
Calculate the area of a circle with diameter 24cm
Answer: 452.39cm² -
4. Ratio
Simplify the ratio 28:20
Answer: 7:5 -
5. Statistics
Find the range of: 18, 17, 17, 23, 45
Answer: 28