Keystones — Cornerstone
Five GCSE retrieval questions · 27 June 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 87 + ? = 167
Answer: 80 -
2. Algebra
Solve: 5x = 20
Answer: x = 4 -
3. Geometry
Find the area of a circle with radius 3cm
Answer: 28.27cm² -
4. Ratio
Simplify: 20:20:8
Answer: 5:5:2 -
5. Statistics
Find the mean of: 6, 3, 9
Answer: 6