Keystones — Cornerstone
Five GCSE retrieval questions · 21 October 2025 · mathsvault.uk/keystones
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1. Number
Add: 3⁄4 + 2⁄5
Answer: 23⁄20 -
2. Algebra
Solve: 4x + 7 = 2x + 19
Answer: x = 6 -
3. Geometry
Calculate the distance between (1, 3) and (4, 7)
Answer: 5 -
4. Ratio
Simplify the ratio 20:30
Answer: 2:3 -
5. Statistics
Find the mean of: 18, 17, 6, 12
Answer: 13.25