Keystones — Cornerstone
Five GCSE retrieval questions · 28 January 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 58 + 63
Answer: 58 + 63 = 121 -
2. Algebra
Factorise: 30x + 12
Answer: 6(5x + 2) -
3. Geometry
Find the hypotenuse of a right triangle with sides 8cm and 15cm
Answer: 17cm -
4. Ratio
Find 62% of 305
Answer: 189.1 -
5. Statistics
Calculate the mean of: 11, 39, 12, 15, 9, 40, 19, 12
Answer: 19.6