Keystones — Cornerstone
Five GCSE retrieval questions · 23 November 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 864 + 239
Answer: 864 + 239 = 1103 -
2. Algebra
Solve: x + 8 = 21
Answer: x = 13 -
3. Geometry
Calculate the distance between (7, 3) and (10, 7)
Answer: 5 -
4. Ratio
Simplify: 10:8:4
Answer: 5:4:2 -
5. Statistics
Calculate the mean of: 43, 10, 21, 19, 9, 9
Answer: 18.5