Keystones — Cornerstone
Five GCSE retrieval questions · 8 February 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 249 + 442
Answer: 249 + 442 = 691 -
2. Algebra
Factorise: 16x + 24
Answer: 4(4x + 6) -
3. Geometry
Calculate the area of a circle with diameter 21cm
Answer: 346.36cm² -
4. Ratio
Simplify the ratio 18:12
Answer: 3:2 -
5. Statistics
Find the range of: 9, 9, 6, 24, 20
Answer: 18