Keystones — Cornerstone
Five GCSE retrieval questions · 22 June 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 63 + ? = 192
Answer: 129 -
2. Algebra
Factorise: 30x + 40
Answer: 5(6x + 8) -
3. Geometry
Opposite = 9cm, hypotenuse = 18cm. Find the angle
Answer: 30° (approximately) -
4. Ratio
Simplify the ratio 21:15
Answer: 7:5 -
5. Statistics
Find the mean of: 9, 10, 10, 10, 3
Answer: 8.4