Keystones — Cornerstone
Five GCSE retrieval questions · 20 December 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 40 + 86
Answer: 40 + 86 = 126 -
2. Algebra
Factorise: 20x + 16
Answer: 4(5x + 4) -
3. Geometry
Calculate the hypotenuse when a = 9cm and b = 7cm
Answer: 11.4cm -
4. Ratio
Simplify the ratio 24:9
Answer: 8:3 -
5. Statistics
Calculate the mean of: 18, 36, 19, 6, 50, 23, 15
Answer: 23.9