Keystones — Cornerstone
Five GCSE retrieval questions · 8 November 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 38 + ? = 114
Answer: 76 -
2. Algebra
Solve: x + 4 = 16
Answer: x = 12 -
3. Geometry
Find the perimeter of a right triangle with sides 3cm and 4cm
Answer: 12cm -
4. Ratio
Simplify the ratio 40:25
Answer: 8:5 -
5. Statistics
Calculate the mean of: 32, 39, 11, 47, 27, 19, 12
Answer: 26.7