Keystones — Lintel

Five GCSE retrieval questions · 8 January 2026 · mathsvault.uk/keystones

1. Number

What is the missing number: 71 + ? = 170

Answer: 99
2. Algebra

Solve: ^x⁄₂ = 6.5

Answer: x = 13
3. Geometry

Opposite = 11cm, adjacent = 16cm. Calculate the angle

Answer: 34.5°
4. Ratio

Simplify: 16:20:24

Answer: 4:5:6
5. Statistics

Calculate the mean of: 26, 12, 31, 44, 31, 31

Answer: 29.2

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