Keystones — Lintel

Five GCSE retrieval questions · 19 January 2026 · mathsvault.uk/keystones

1. Number

Add: ²⁄₅ + ¹⁄₆

Answer: ¹⁷⁄₃₀
2. Algebra

For y = 4x³ + 19, find y when x = 4

Answer: y = 275
3. Geometry

Find c if a = 13cm and b = 15cm in a right triangle

Answer: 19.8cm
4. Ratio

Simplify the ratio 7m:700cm

Answer: 1:100
5. Statistics

Find the range of: -17, 48, -6, -9, 1

Answer: 65

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