Keystones — Capstone

Five GCSE retrieval questions · 18 August 2025 · mathsvault.uk/keystones

1. Number

Calculate: 991 + 627

Answer: 1618
2. Algebra

Solve: ^x⁄₅ = 2.6

Answer: x = 13
3. Geometry

Find c if a = 13cm and b = 10cm in a right triangle

Answer: 16.4cm
4. Ratio

Simplify the ratio 8m:800cm

Answer: 1:100
5. Statistics

The mean of 4 numbers is 31. If 3 of them are 31, 35, 39, what is the missing number?

Answer: 19

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