Keystones — Cornerstone
Five GCSE retrieval questions · 15 April 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 70 + 69
Answer: 70 + 69 = 139 -
2. Algebra
Solve: x + 11 = 23
Answer: x = 12 -
3. Geometry
Find the perimeter of a right triangle with sides 6cm and 8cm
Answer: 24cm -
4. Ratio
Simplify: 8:12:8
Answer: 2:3:2 -
5. Statistics
Calculate the mean of: 37, 30, 31, 18, 48, 17, 30
Answer: 30.1