Keystones — Cornerstone
Five GCSE retrieval questions · 10 July 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 81 + ? = 133
Answer: 52 -
2. Algebra
What is the next term? 8, 24, 72, 216, ...
Answer: 648 -
3. Geometry
Opposite = 7cm, hypotenuse = 9.9cm. Find the angle
Answer: 45° (approximately) -
4. Ratio
Calculate 10% of 30
Answer: 3 -
5. Statistics
Find the mean of: 9, 9, 5, 17
Answer: 10