Keystones — Lintel

Five GCSE retrieval questions · 7 January 2026 · mathsvault.uk/keystones

1. Number

What is the missing number: 76 + ? = 107

Answer: 31
2. Algebra

Solve: ^x⁄₇ = 4.5714285714286

Answer: x = 32
3. Geometry

Opposite = 19cm, adjacent = 16cm. Calculate the angle

Answer: 49.9°
4. Ratio

Simplify: 10:6:12

Answer: 5:3:6
5. Statistics

A bag has 8 red and 3 blue balls. What is the probability of picking a red ball?

Answer: ⁸⁄₁₁

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