Keystones — Lintel

Five GCSE retrieval questions · 21 October 2025 · mathsvault.uk/keystones

1. Number

Find the total of 231, 207, and 123

Answer: 561
2. Algebra

Solve: ^x⁄₆ = 4.6666666666667

Answer: x = 28
3. Geometry

Adjacent = 21cm, hypotenuse = 36cm. Find the angle

Answer: 54.3°
4. Ratio

Calculate 12.4% of 352

Answer: 43.65
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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