Keystones — Lintel

Five GCSE retrieval questions · 4 January 2026 · mathsvault.uk/keystones

1. Number

Calculate: 991 + 810

Answer: 1801
2. Algebra

Solve: ^x⁄₅ = 4.4

Answer: x = 22
3. Geometry

Adjacent = 27cm, hypotenuse = 35cm. Find the angle

Answer: 39.5°
4. Ratio

Simplify: 8:4:10

Answer: 4:2:5
5. Statistics

A bag has 4 red and 5 blue balls. What is the probability of picking a red ball?

Answer: ⁴⁄₉

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