Keystones — Cornerstone
Five GCSE retrieval questions · 15 October 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 20 + 98
Answer: 20 + 98 = 118 -
2. Algebra
Solve: 3x = 39
Answer: x = 13 -
3. Geometry
Find the perimeter of a right triangle with sides 3cm, 4cm, 5cm
Answer: 12cm -
4. Ratio
Simplify the ratio 40:25
Answer: 8:5 -
5. Statistics
Find the mean of: 9, 18, 6
Answer: 11