Keystones — Cornerstone

Five GCSE retrieval questions · 11 March 2026 · mathsvault.uk/keystones

1. Number

What is the missing number: 50 + ? = 197

Answer: 147
2. Algebra

Solve: 4x = 16

Answer: x = 4
3. Geometry

Opposite = 6cm, hypotenuse = 12cm. Find the angle

Answer: 30° (approximately)
4. Ratio

Simplify: 12:12:10

Answer: 6:6:5
5. Statistics

What is the probability of getting heads when flipping a fair coin?

Answer: ¹⁄₂

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