Keystones — Lintel

Five GCSE retrieval questions · 4 November 2025 · mathsvault.uk/keystones

1. Number

Calculate: 990 + 864

Answer: 1854
2. Algebra

Solve: ^x⁄₆ = 5.3333333333333

Answer: x = 32
3. Geometry

Find c if a = 11cm and b = 20cm in a right triangle

Answer: 22.8cm
4. Ratio

Simplify the ratio 2m:200cm

Answer: 1:100
5. Statistics

Find the range of: -30, -28, 14, 19, 38

Answer: 68

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