Keystones — Cornerstone

Five GCSE retrieval questions · 30 July 2025 · mathsvault.uk/keystones

1. Number

What is the missing number: 81 + ? = 144

Answer: 63
2. Algebra

Expand: 2(2x + 5)

Answer: 4x + 10
3. Geometry

Opposite = 8cm, adjacent = 18cm. Calculate the angle

Answer: 24°
4. Ratio

Simplify: 18:12:18

Answer: 3:2:3
5. Statistics

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

Answer: ¹⁄₂

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