Keystones — Lintel

Five GCSE retrieval questions · 24 November 2025 · mathsvault.uk/keystones

1. Number

Find the total of 231, 173, and 88

Answer: 492
2. Algebra

Solve: ^x⁄₃ = 6.3333333333333

Answer: x = 19
3. Geometry

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

Answer: 59.1°
4. Ratio

Simplify the ratio 2m:200cm

Answer: 1:100
5. Statistics

A bag has 3 red and 3 blue balls. What is the probability of picking a red ball?

Answer: ¹⁄₂

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