Keystones — Cornerstone

Five GCSE retrieval questions · 24 June 2025 · mathsvault.uk/keystones

1. Number

Add: ⁴⁄₅ + ¹⁄₃

Answer: ¹⁷⁄₁₅
2. Algebra

What is the next term? 4, 12, 36, 108, ...

Answer: 324
3. Geometry

Opposite = 11cm, hypotenuse = 12.7cm. Find the angle

Answer: 60° (approximately)
4. Ratio

Simplify the ratio 25:20

Answer: 5:4
5. Statistics

Calculate the mean of: 18, 7, 30, 41, 20, 46

Answer: 27

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