Keystones — Lintel

Five GCSE retrieval questions · 23 November 2025 · mathsvault.uk/keystones

1. Number

What is the missing number: 87 + ? = 186

Answer: 99
2. Algebra

Solve: ^x⁄₇ = 4.2857142857143

Answer: x = 30
3. Geometry

Find the perimeter: hypotenuse = 24cm, one side = 12cm

Answer: 56.8cm
4. Ratio

Simplify: 8:16:20

Answer: 2:4:5
5. Statistics

Find the range of: 14, -3, 34, 25, -27

Answer: 61

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