Keystones — Lintel

Five GCSE retrieval questions · 30 August 2025 · mathsvault.uk/keystones

1. Number

Calculate: 992 + 900

Answer: 1892
2. Algebra

Solve: 9x = 99

Answer: x = 11
3. Geometry

Adjacent = 20cm, hypotenuse = 39cm. Find the angle

Answer: 59.1°
4. Ratio

Simplify: 6:12:8

Answer: 3:6:4
5. Statistics

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

Answer: ⁵⁄₉

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