Keystones — Cornerstone
Five GCSE retrieval questions · 28 November 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 28 + 70
Answer: 28 + 70 = 98 -
2. Algebra
Expand: 6(x + 8)
Answer: 6x + 48 -
3. Geometry
Find the perimeter of a right triangle with sides 3cm and 4cm
Answer: 12cm -
4. Ratio
Calculate 25% of 47
Answer: 11.75 -
5. Statistics
Find the mean of: 20, 11, 17, 5
Answer: 13.25