Keystones — Cornerstone
Five GCSE retrieval questions · 10 October 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 25 + 79
Answer: 25 + 79 = 104 -
2. Algebra
Expand: 8(x + 9)
Answer: 8x + 72 -
3. Geometry
Find the perimeter of a right triangle with sides 3cm, 4cm, 5cm
Answer: 12cm -
4. Ratio
Simplify: 8:12:4
Answer: 2:3:1 -
5. Statistics
Find the mean of: 3, 19, 15
Answer: 12.333333333333