Keystones — Lintel

Five GCSE retrieval questions · 14 August 2026 · mathsvault.uk/keystones

1. Number

What is the missing number: 32 + ? = 122

Answer: 90
2. Algebra

Solve: 4x = 56

Answer: x = 14
3. Geometry

Find the perimeter: hypotenuse = 20cm, one side = 11cm

Answer: 47.7cm
4. Ratio

Simplify: 8:8:12

Answer: 2:2:3
5. Statistics

A spinner has 5 red, 2 blue and 6 green sections. Probability of landing on red?

Answer: ⁵⁄₁₃

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