Keystones — Cornerstone
Five GCSE retrieval questions · 5 March 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 80 + ? = 116
Answer: 36 -
2. Algebra
Simplify: 7x + 3x
Answer: 10x -
3. Geometry
Calculate perimeter: two sides are 6cm and 15cm at right angles
Answer: 37.2cm -
4. Ratio
Simplify: 12:20:24
Answer: 3:5:6 -
5. Statistics
Calculate the mean of: 40, 40, 7, 40, 9, 5, 22, 26
Answer: 23.6