Keystones — Cornerstone
Five GCSE retrieval questions · 20 July 2026 · mathsvault.uk/keystones
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1. Number
What is the missing number: 66 + ? = 186
Answer: 120 -
2. Algebra
Expand: 2(x + 2)
Answer: 2x + 4 -
3. Geometry
Opposite = 14cm, hypotenuse = 16.2cm. Find the angle
Answer: 60° (approximately) -
4. Ratio
Simplify: 9:12:18
Answer: 3:4:6 -
5. Statistics
Calculate the range of: 44, 28, 66, 51, 57, 38
Answer: 38