Keystones — Cornerstone

Five GCSE retrieval questions · 21 August 2025 · mathsvault.uk/keystones

1. Number

Calculate: ²⁄₁₁ + ⁶⁄₁₁

Answer: ⁸⁄₁₁
2. Algebra

Solve: 3x = 12

Answer: x = 4
3. Geometry

Find the area of a right triangle with base 7cm and height 11cm

Answer: 38.5cm²
4. Ratio

Simplify the ratio 12:9

Answer: 4:3
5. Statistics

Calculate the mean of: 49, 18, 43, 40, 13, 28, 18

Answer: 29.9

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