Keystones — Lintel

Five GCSE retrieval questions · 7 April 2026 · mathsvault.uk/keystones

1. Number

The sum of three consecutive numbers is 150. What are the numbers?

Answer: 49, 50, and 51
2. Algebra

Solve: ^x⁄₄ = 7.5

Answer: x = 30
3. Geometry

A right triangle has hypotenuse 10cm and one side 6cm. Find its area

Answer: 24cm²
4. Ratio

Simplify: 6:6:10

Answer: 3:3:5
5. Statistics

Find the range of: -11, 14, -5, 37, 21

Answer: 48

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