Keystones — Lintel

Five GCSE retrieval questions · 27 April 2026 · mathsvault.uk/keystones

1. Number

What is the missing number: 65 + ? = 144

Answer: 79
2. Algebra

Solve: ^x⁄₃ = 6.3333333333333

Answer: x = 19
3. Geometry

Adjacent = 17cm, hypotenuse = 30cm. Find the angle

Answer: 55.5°
4. Ratio

Simplify: 18:15:15

Answer: 6:5:5
5. Statistics

A bag has 6 red and 7 blue balls. What is the probability of picking a red ball?

Answer: ⁶⁄₁₃

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