Keystones — Cornerstone
Five GCSE retrieval questions · 28 September 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 225 + 317
Answer: 225 + 317 = 542 -
2. Algebra
Solve: 3x = 15
Answer: x = 5 -
3. Geometry
Calculate the area of a circle with diameter 21cm
Answer: 346.36cm² -
4. Ratio
Calculate 50% of 98
Answer: 49 -
5. Statistics
Calculate the mean of: 33, 16, 25, 38, 8, 9, 28
Answer: 22.4