Keystones — Cornerstone
Five GCSE retrieval questions · 1 August 2025 · mathsvault.uk/keystones
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1. Number
Find the total of 255, 168, and 63
Answer: 486 -
2. Algebra
Expand: 2(5x + 2)
Answer: 10x + 4 -
3. Geometry
Find the hypotenuse of a right triangle with sides 8cm and 15cm
Answer: 17cm -
4. Ratio
Simplify the ratio 28:32
Answer: 7:8 -
5. Statistics
Find the mean of: 7, 9, 2, 19
Answer: 9.25