Keystones — Cornerstone
Five GCSE retrieval questions · 29 January 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 66 + ? = 140
Answer: 74 -
2. Algebra
Collect like terms: 8x + 4y + 6x + 3y
Answer: 14x + 7y -
3. Geometry
Calculate the hypotenuse when a = 10cm and b = 15cm
Answer: 18.03cm -
4. Ratio
Simplify: 6:4:10
Answer: 3:2:5 -
5. Statistics
Find the mean of: 17, 9, 8, 15, 11
Answer: 12