Keystones — Cornerstone
Five GCSE retrieval questions · 29 October 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 489 + 501
Answer: 489 + 501 = 990 -
2. Algebra
Expand: 8(x + 3)
Answer: 8x + 24 -
3. Geometry
Calculate the hypotenuse when a = 9cm and b = 13cm
Answer: 15.81cm -
4. Ratio
Simplify: 8:16:24
Answer: 1:2:3 -
5. Statistics
Calculate the mean of: 40, 25, 31, 19, 27, 44, 48, 27
Answer: 32.6