Keystones — Cornerstone
Five GCSE retrieval questions · 25 June 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 66 + ? = 166
Answer: 100 -
2. Algebra
Solve: x + 12 = 27
Answer: x = 15 -
3. Geometry
Opposite = 12cm, hypotenuse = 13.9cm. Find the angle
Answer: 60° (approximately) -
4. Ratio
Simplify: 15:6:12
Answer: 5:2:4 -
5. Statistics
Calculate the mean of: 17, 9, 24, 46, 14, 19, 42, 21
Answer: 24