Keystones — Cornerstone
Five GCSE retrieval questions · 18 October 2025 · mathsvault.uk/keystones
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1. Number
Calculate: 63 + 99
Answer: 63 + 99 = 162 -
2. Algebra
Solve: 6x + 10 = 4x + 28
Answer: x = 9 -
3. Geometry
Find the hypotenuse of a right triangle with sides 8cm and 15cm
Answer: 17cm -
4. Ratio
Calculate 10% of 108
Answer: 10.8 -
5. Statistics
Calculate the mean of: 28, 10, 29, 9, 44, 5, 20
Answer: 20.7