Keystones — Cornerstone
Five GCSE retrieval questions · 3 February 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 52 + 84
Answer: 52 + 84 = 136 -
2. Algebra
Factorise: 30x + 10
Answer: 5(6x + 2) -
3. Geometry
Find the perimeter of a right triangle with sides 5cm and 12cm
Answer: 30cm -
4. Ratio
Find 16% of 266
Answer: 42.56 -
5. Statistics
Calculate the mean of: 15, 41, 17, 19, 43, 29, 18, 18
Answer: 25