Keystones — Cornerstone

Five GCSE retrieval questions · 26 June 2026 · mathsvault.uk/keystones

1. Number

Calculate: 25 + 48

Answer: 25 + 48 = 73
2. Algebra

Simplify: 7x + 8x

Answer: 15x
3. Geometry

Opposite = 10cm, adjacent = 15cm. Calculate the angle

Answer: 33.7°
4. Ratio

Simplify: 4:12:10

Answer: 2:6:5
5. Statistics

A bag has 4 red and 6 blue balls. What is the probability of picking a red ball?

Answer: ²⁄₅

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