Keystones — Lintel

Five GCSE retrieval questions · 2 May 2026 · mathsvault.uk/keystones

1. Number

Find the missing number: 1.67 + □ = 19.98

Answer: □ = 18.31
2. Algebra

Solve: ^x⁄₅ = 7.8

Answer: x = 39
3. Geometry

Adjacent = 24cm, hypotenuse = 38cm. Find the angle

Answer: 50.8°
4. Ratio

Simplify: 18:6:18

Answer: 3:1:3
5. Statistics

Find the range of: -16, 7, 0, 39, -22

Answer: 61

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