Keystones — Cornerstone

Five GCSE retrieval questions · 25 November 2025 · mathsvault.uk/keystones

1. Number

6000

Answer: 6 × 10³
2. Algebra

Solve: 8x = 24

Answer: x = 3
3. Geometry

Opposite = 9cm, hypotenuse = 18cm. Find the angle

Answer: 30° (approximately)
4. Ratio

Simplify the ratio 35:15

Answer: 7:3
5. Statistics

Calculate the mean of: 50, 28, 30, 9, 13, 38, 31

Answer: 28.4

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