Keystones — Capstone

Five GCSE retrieval questions · 28 August 2025 · mathsvault.uk/keystones

1. Number

Calculate: 996 + 671

Answer: 1667
2. Algebra

Solve: ^x⁄₃ = 9.6666666666667

Answer: x = 29
3. Geometry

Adjacent = 17cm, hypotenuse = 31cm. Find the angle

Answer: 56.7°
4. Ratio

Calculate 35.8% of 806

Answer: 288.55
5. Statistics

The mean of 5 numbers is 25. If 4 of them are 25, 31, 49, 41, what is the missing number?

Answer: -21

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