Keystones — Cornerstone
Five GCSE retrieval questions · 16 February 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 56 + ? = 168
Answer: 112 -
2. Algebra
Factorise: 12x + 18
Answer: 6(2x + 3) -
3. Geometry
Find the area of a circle with radius 3cm
Answer: 28.27cm² -
4. Ratio
Simplify: 24:20:8
Answer: 6:5:2 -
5. Statistics
Calculate the mean of: 17, 34, 50, 33, 7, 16, 25
Answer: 26