Keystones — Lintel

Five GCSE retrieval questions · 1 May 2026 · mathsvault.uk/keystones

1. Number

What is the missing number: 61 + ? = 136

Answer: 75
2. Algebra

Solve: ^x⁄₃ = 3.3333333333333

Answer: x = 10
3. Geometry

Calculate the hypotenuse when a = 10cm and b = 8cm

Answer: 12.81cm
4. Ratio

Simplify: 6:12:6

Answer: 1:2:1
5. Statistics

Find the range of: -24, 4, 1, 25, -14

Answer: 49

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