Keystones — Lintel

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

1. Number

Simplify: 6√2 - 2√2

Answer: 4√2
2. Algebra

Solve: ^x⁄₄ = 6.25

Answer: x = 25
3. Geometry

A circle has area 78.5cm². Find its radius (dp)

Answer: 5cm
4. Ratio

Simplify: 8:12:10

Answer: 4:6:5
5. Statistics

Calculate the mean of: 50, 39, 21, 11, 50, 7, 29

Answer: 29.6

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